Ph 104 Astronomy Homework 3 Solutions For Mole

Chemistry

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Introduction

  • What Is Chemistry?
  • Scientific Method
    • Measurement

      • Quantitative and Qualitative
      • Units of Measurement
      • Unit Conversions
      • Temperature Scales
      • SI System of Measurement
      • Significant Figures
      • Scientific Notation
      • Accuracy, Precision, and Percent Error
      • Density
      • Graphing: independent and dependent variables
      • Drawing Graphs
        • Matter

          • What is Matter?
          • Everything is Made of Atoms
          • Elements
          • Compounds
          • Mixtures
          • Phases of Matter
          • Phase Changes
          • Separating Mixtures
          • Physical and Chemical Changes
          • Mass Number
          • Net Charge
          • Basic Atomic Structure
          • Atomic Number
          • Isotopes
          • Atomic Mass
            • The Periodic Table

              • The Periodic Table
              • Metals and Nonmetals
              • Metalloids
              • Periodic Trends in Atomic Size
              • Periodic Trends in Ionic Size
              • Periodic Trends in Ionization Energy
              • Periodic Trends in Electronegativity
              • Periodic Trends in Electron Affinity
              • Valence Electrons
                • Bonding Basics

                  • Bonding
                  • Octet Rule
                  • Electronegativity
                  • Ionic Bonding
                  • Covalent Bonding
                  • Metallic Bonding
                  • Properties of ionic, covalent, and metallic compounds
                    • Ionic Bonds

                      • Ionic Bond Formation
                      • Ionic Compounds
                      • Covalent compounds
                      • Metallic Compounds
                      • Polyatomic Ions
                      • Writing Ionic Formulas
                      • Naming Ionic Compounds
                      • Ionic vs. Molecular Bonds
                        • Covalent Bonds

                          • Covalent Bond Formation
                          • Covalent Formulas and Nomenclature
                          • Drawing Lewis Structures
                          • Resonance
                          • VSEPR
                            • Intermolecular Bonding

                              • Intermolecular Bonds
                              • Polarity of Bonds
                              • Polarity of Molecules
                              • Hydrogen Bonds
                              • Dipole-Dipole Interactions
                              • Van der Waals Interactions
                              • Properties of Intermolecular Bonds
                                • A Closer Look at The Atom

                                  • Atomic Models
                                  • Mass Conservation
                                  • Laws of Proportions
                                  • Cathode Ray Tube Experiment
                                  • Millikan's Oil Drop Experiment
                                  • Rutherford's Gold Foil Experiment
                                  • Discovery of the Neutron
                                    • Bohr Model of the Atom

                                      • Transverse waves
                                      • Light and Electromagnetic Radiation
                                      • Calculations with wavelength and frequency
                                      • Planck's constant
                                      • Atoms and Electromagnetic Spectra
                                      • Excited States and Ground States
                                      • Bohr Model of the atom
                                        • Quantum Mechanical Model of the Atom

                                          • The Dual Nature of Light
                                          • DeBroglie: Wave Characteristics of Matter
                                          • Orbitals, and Probability Patterns
                                          • Heisenberg Uncertainty Principle
                                            • Electron Configuration

                                              • s,p,d,f Orbitals
                                              • Noble Gas Shorthand
                                              • Quantum Numbers
                                              • Valence Electrons
                                              • Electron Configuration
                                                • Molecular Orbital Theory

                                                  • Molecular Orbital Theory
                                                  • Sigma Bonds
                                                  • Pi Bonds
                                                  • Molecular Geometry
                                                  • Bonding and Antibonding Orbitals
                                                  • Orbital Hybridization
                                                    • Chemical Reactions

                                                      • Review of Elements and Compounds
                                                      • Chemical and Physical Properties
                                                      • Chemical Equations
                                                      • Balancing Chemical Equations
                                                      • Chemical Reactions and Equations
                                                      • Redox Reactions
                                                      • Synthesis Reactions
                                                      • Decomposition Reactions
                                                      • Single Replacement Reactions
                                                      • Double Replacement Reactions
                                                        • The Mole Concept

                                                          • The Mole
                                                          • Determining Formula
                                                          • Percent Composition
                                                          • Empirical and Molecular Formulas
                                                            • Stoichiometry

                                                              • Stoichiometry
                                                              • Mole Ratios
                                                              • Equation Stoichiometry
                                                              • Limiting Reagent
                                                              • Percent Yield
                                                                • Phases of Matter

                                                                  • Phases of Matter
                                                                  • Properties of Solids, Liquids, and Gases
                                                                  • Intermolecular Forces of Attraction
                                                                  • How Intermolecular Forces Affect Phases of Matter
                                                                  • Changes of State
                                                                  • Dynamic Equilibrium
                                                                  • Vapor Pressure and Boiling
                                                                  • Phase Diagrams
                                                                    • Gases

                                                                      • Kinetic Theory of Gases
                                                                      • Gas Pressure
                                                                      • Measuring Gas Pressure
                                                                      • Atmospheric Pressure
                                                                      • Absolute Zero
                                                                      • Gas Laws
                                                                      • Boyle's Law
                                                                      • Charles' Law
                                                                      • Avogadro's Law
                                                                      • Gay Lussac's Law
                                                                      • Combined Gas Law
                                                                      • Ideal Gas Law
                                                                      • Molar Volume of a Gas
                                                                      • Gas Stoichiometry
                                                                      • Partial Pressure
                                                                      • Preparation and Reactions of Gases
                                                                        • Solutions

                                                                          • Solutions
                                                                          • Solute
                                                                          • Solvent
                                                                          • Solution Formation
                                                                          • Solvation and Dissociation
                                                                          • Saturated and Supersaturated Solutions
                                                                          • Measuring Concentration
                                                                          • Solving Using PPM (Parts Per Million)
                                                                          • Molarity
                                                                          • Molality
                                                                          • Percent Concentration
                                                                          • Dilution Calculations
                                                                          • Osmolarity
                                                                          • Factors Affecting Solubility
                                                                          • Solubility Graphs
                                                                          • Colligative Properties
                                                                          • Separating Mixtures
                                                                            • Chemical Kinetics

                                                                              • Rate of Reactions
                                                                              • Collision Theory
                                                                              • Potential Energy Diagrams
                                                                              • Rate Law
                                                                                • Chemical Equilibrium

                                                                                  • Dynamic Equilibrium
                                                                                  • Equilibrium Constants
                                                                                  • Equilibrium Stoichiometry
                                                                                  • Ksp
                                                                                  • Kep
                                                                                  • Le Chatelier's principle
                                                                                  • Solubility Equilbria
                                                                                    • Acids and Bases

                                                                                      • Acids and Bases
                                                                                      • Properties of Acids and Bases
                                                                                      • Arrhenius Acids and Bases
                                                                                      • pH
                                                                                      • pH calculations
                                                                                      • Intermolecular Forces of Attraction
                                                                                      • Stoichiometry with Acid and Base Dissociation
                                                                                      • Conjugate Acids and Conjugate Bases
                                                                                      • Brønsted–Lowry Acids and Bases
                                                                                      • Lewis Acids and Bases
                                                                                        • Reactions in Solution

                                                                                          • Reactions Between Ions in Solutions
                                                                                          • Stoichiometry of Reactions Between Ions in Solutions
                                                                                          • Neutralization
                                                                                          • Titration Calculations
                                                                                          • Buffer Theory
                                                                                          • Buffer Calculations
                                                                                            • Thermochemistry

                                                                                              • Energy Change in Reactions
                                                                                              • Enthalpy
                                                                                              • Exothermic processes
                                                                                              • Endothermic processes
                                                                                              • Specific Heat
                                                                                              • Calorimetry
                                                                                              • Thermochemistry of Phase Changes
                                                                                              • Thermochemistry with Equation Stoichiometry
                                                                                              • Hess' Law
                                                                                              • Born-Haber Cycle - Formation
                                                                                              • Born-Haber Cycle - Solution
                                                                                              • Spontaneous and Non-Spontaneous Processes
                                                                                              • Entropy
                                                                                              • Gibbs Free Energy
                                                                                                • Electrochemistry

                                                                                                  • Oxidation and Reduction Reactions
                                                                                                  • Oxidation Numbers
                                                                                                  • Balancing Redox Equations Using the Oxidation Number Method
                                                                                                  • Metal Activity Series
                                                                                                  • Galvanic Cells
                                                                                                  • Electrolysis
                                                                                                  • Calculating Energy in Electrochemical Processes
                                                                                                    • Nuclear Chemistry

                                                                                                      • Nuclear Chemistry
                                                                                                      • Isotope Notation
                                                                                                      • Isotope Stability
                                                                                                      • Alpha Decay
                                                                                                      • Beta Decay
                                                                                                      • Positron Decay
                                                                                                      • Electron Capture
                                                                                                      • Nuclear Equations
                                                                                                      • Nuclear Half-Life
                                                                                                      • Nuclear Half-Life Calculations
                                                                                                      • Nuclear Transmutation
                                                                                                      • Fission and Fusion
                                                                                                      • Applications of Nuclear Chemistry
                                                                                                      • Biological Effects of Radiation
                                                                                                        • Organic Chemistry

                                                                                                          • Introduction to Carbon Chemistry
                                                                                                          • Naming Alkanes, Alkenes, and Alkynes
                                                                                                          • Aromatics
                                                                                                          • Functional Groups and Naming
                                                                                                          • Polymer Chemistry
                                                                                                          • Biochemical Molecules
                                                                                                          • Isomerisms
                                                                                                            • Useful Analysis Tips

                                                                                                              • Using Microsoft Excel for Figures and Statistical Analysis
                                                                                                              • Using Microsoft Excel to Analyze Data Using Linear Regression
                                                                                                              • Correct Use of a Scientific Notation on a Scientific Calculator
                                                                                                                • Uncategorized Questions

                                                                                                                  • What is the volume of a 0.50 mole of gas at STP if it behaves ideally?
                                                                                                                  • Using Le Chateliers principle, in the reduction of iron oxide, what would happen if you increase the concentration of CO?
                                                                                                                  • Why is the pizza sauce hotter then the pizza crust?
                                                                                                                  • How to find pKa based on pH and concentration?
                                                                                                                  • What's the protocol for making 200mL of 15% (w/v) aqueous solution? Thanks a bunch in advance!
                                                                                                                  • What are the expected products of hydrolysis of lactose?
                                                                                                                  • The particles which of the following gases has the highest/lowest average speed? Which gas particles have the highest/lowest average kinetic energy? a.) argon at 20°C. b.)nitrogen at 20°C b.) nitrogen at 100°C. c.) helium at 100°C
                                                                                                                  • What volume of 0.125M H2SO4 is required to neutralize 2.5g of Ca (OH)2?
                                                                                                                  • Absorbing and Releasing Energy?
                                                                                                                  • What is happening to the particles as solid→liquid or a liquid→gas and why does it make sense?
                                                                                                                  • If #psi=A(x)e^(itheta(x))#where #A(x) and theta(x)# are real functions prove that the probability current #J(x,t) = |A(x)|^2(ℏ/m)d/(dx)(theta(x))#.?
                                                                                                                  • What is the answer to 1st question and why?
                                                                                                                  • HOAc Ka = 1.8 * 10–5 H2CO3 Ka1 = 4.3 * 10–7 Ka2 = 5.6 * 10–11 Which of the following 0.01 M solutions has the highest pH?
                                                                                                                  • Atoms can be broken down through __________ processes. Please help?!
                                                                                                                  • Assuming complete precipitation of AgCl, calculate the sum if the molar concentration of all the ions if 2 lit. of 2M Ag2SO4 is mixed with 4 lit. of 1M NaCl solution?
                                                                                                                  • How do you solve single and double replacement problems?
                                                                                                                  • Calculate solubility of Ca3(PO4)2 in pure water if its solubility product is 1.08×10^-23?
                                                                                                                  • Solve for Volume (Ideal Gas Law)?
                                                                                                                  • Write a balanced molecular equation for the reaction of hydrochloric acid and calcium?
                                                                                                                  • If 20.0ml of NaOH are needed to neutralize 10.0ml of 3.0M H2SO4, what is the concentration of the NaOH?
                                                                                                                  • What is Iodine-131 nuclear decay series?
                                                                                                                  • What is the order of a reaction if its rate increases by a factor of 13 when the reactant concentration increases by a factor of 3.6?
                                                                                                                  • A reaction has a value of Kc at 400 degrees C of 0.500. If the value of Q for that reaction is 23.1, will the reaction need to go towards reactants or products to achieve equilibrium? Type the word.
                                                                                                                  • A 25g sample of garden compost was analyzed for chloride content. the sample was dissolved in water, and the chloride was precipitated as silver chloride 1.58g of dried precipitate was obtained. Calculate the mass percent of chloride in the sample?
                                                                                                                  • What mass of ethanol, C2H5OH, Is required to produce 300ml of a 0.5M solution?
                                                                                                                  • What is the freezing point of an aqueous solution containing 468 g of C12H22O11 in 350 g of water? Round off in 2SF.
                                                                                                                  • The mineral chalcocite (Cu2S) and malachite (CuCO3 (OH)2) are two primary sources of copper. what is the oxidation state of copper in each of these minerals?
                                                                                                                  • Given Ksp, how can I calculate solubility?
                                                                                                                  • What is the value of l in 4s1?
                                                                                                                  • Ionic equation for the reaction between dichromate ions & hydroxyl ions?
                                                                                                                  • Can someone help me solve this ??
                                                                                                                  • How and where is Iodine-131 is made?
                                                                                                                  • The radioactive element​ carbon-14 has a​ half-life of 5750 years. A scientist determined that the bones from a mastodon had lost 67.9​% of their​ carbon-14. How old were the bones at the time they were​ discovered?
                                                                                                                  • If you have 13 moles of Calcium, how many grams of Ca0 will be Produced?
                                                                                                                  • Explain K+,Ar,Cl are iso electronic but their sizes are different.why?
                                                                                                                  • If some solid chloride was dissolved in a saturated solution of PbCl2, how would this affect the molar solubility of PbCl2 ?
                                                                                                                  • How many moles of potassium nitrate are in 1.23 x 10^16 formula units?
                                                                                                                  • Use the following chemical equation to answer the question below. What if 0.060 g of magnesium completely react in 25 s, what is the average reaction rate in moles/second over that time interval? (Full question in screenshot)
                                                                                                                  • For the generic reaction 2 A + B <----> 3 C + D ?
                                                                                                                  • Calculate the ratio of the broglie wavelength associated with an alpha particle moving with velocity v and a deuteron moving with velocity 2v?
                                                                                                                  • A piece of wood has a mass of 200 g and a volume of 400 mL. calculate its density?
                                                                                                                  • What is redox reaction?
                                                                                                                  • Ionization Energy?
                                                                                                                  • Find atomic mass unit in terms of electrons?
                                                                                                                  • An aqueous solution containing 3,42 grams per 100 grams of water has a freezing point depression of 0,186deg c. What is the molecular mass of the solute?
                                                                                                                  • A 0.682 g sample of ICl(g) is placed in a 765 ml reaction vessel at 682 K. when equilibrium is reached in the reaction 2ICl(g) <=> I2(g) + Cl2(g) 0.0383 g of I2 is found in the mixture. What is Kc for this reaction?
                                                                                                                  • Chemistry question over thermodynamics?
                                                                                                                  • Determine the heat energy that must be added to bring 15 grams of water at 323K to 355K?
                                                                                                                  • In order to ionize a hydrogen atom, aphoton has a to have 13.6 eV of energy. What would be that photon's frequency (Hz)?
                                                                                                                  • A compounds empirical formula is CH .if the molar mass (gram formula mass) is 117g ,what is the molecular formula?
                                                                                                                  • Calculate the temperature of a 0.50 mol sample of gas at 0.987 atm and a volume of 12 L?
                                                                                                                  • When a 120 g sample of aluminum absorbs 9612 J of heat energy, its temperature increases from 25 (degrees) C to 115 (degrees) C. Find the specific heat of aluminum. Help?
                                                                                                                  • How do you measure the concentration of an acid or a base?
                                                                                                                  • What is 90.3333333 to 2 significant figures?? Thank you.
                                                                                                                  • As the strength of intermolecular forces increases, the ease of evaporation????
                                                                                                                  • How do you figure out a molecule's solubility in water?
                                                                                                                  • Calculating equilibrium constant and concentrations of reactants at equilibrium?
                                                                                                                  • Which of the following terms is used for the chemical composition of a compound? Please help?
                                                                                                                  • How are ferrous ion and ferric ion formed from iron atoms?
                                                                                                                  • In the oxidation of carbon monoxide to carbon dioxide, 2CO(g)+O2​(g)-->2CO2​(g), what is the numerical ratio of the rate of change in the concentration of CO2 to the rate of change in the concentration of O2?
                                                                                                                  • What is the molarity (M) of a solution that has 2.5 mols in .900 liters?
                                                                                                                  • In a closed chamber, 58 grams of propane gas (C3H8) and 200 grams of oxygen are sparked to initiate the comubustion what is the limited reagent in this reaction?
                                                                                                                  • In an experiment 350 mL of hydrogen gas was collected over water at 27 degrees C an 72 cm Hg. Then the absolute temperature doubled, the total pressure changed to 1 atm, and one-third of The has leaked out of the container. What would the final volume be?
                                                                                                                  • If pure phosgene at an initial pressure of 1.1 atm decomposes, what are the equilibrium pressures of all species?
                                                                                                                  • Sir O2 is the molecular form of element O.O.I know that we can separate the O2 into individual O. But if we apply or suply a tremendous amount of heat to 0 can we separate the atoms of O? ? ?
                                                                                                                  • In a row in the periodic table as the atomic number increases the atomic radius generally?
                                                                                                                  • In a first order reaction A---> B the ratio of molar concentration of A and B in the reaction mixture after 100 minute is 1:3. What would be the time needed from the start to have them in the ratio of 1:1?
                                                                                                                  • What properties make some metalloids useful in electronic equipment such as computers?
                                                                                                                  • Calculate the molarity of 25.0 grams of KBr dissolved in 750.0 mL?
                                                                                                                  • What is the formula for Barium nitrate plus sodium phosphate?
                                                                                                                  • What is the conjugate of NH3- ?
                                                                                                                  • How many grams of oxygen are needed to burn 10.0 moles of C3H8?
                                                                                                                  • Describe the movement of particles during equilibrium ?
                                                                                                                  • Hydrogen bromide dissociates when heated according to the eq: #2HBr(g)# #rightleftharpoons# #H_2(g)# + #Br_2(g)# The equilibrium constant #K_c# equals 1.6 x #10^-2# at #200^oC#. (question below?)
                                                                                                                  • One of the hydrides of boron has molar mass=122.22g/mol and is 11.55% by mass hydrogen. Determine its molecular formula?
                                                                                                                  • According to the periodic table , a single carbon has a mass of 12.011 amu. what is the mass of a single carbon atom in grams?
                                                                                                                  • For the reaction 2 H 2 + O 2 → 2 H 2 O , how many moles of water can be produced from 10.3 mol of oxygen?
                                                                                                                  • Give me an example of voltaic cell. Explain how reactions occur in a voltaic cell?
                                                                                                                  • What is formed when calcium chloride and sodium carbonate are mixed?
                                                                                                                  • If the no.of protons of an element is 8 and no.of neutrons are also 8. Write the notation of that element?
                                                                                                                  • What is the stationary phase in gas chromatography?
                                                                                                                  • What is the solution to the question; The hydrogen ion concentration of a sample of orange juice is #2.0×10^-11mol# #dm^-3#. What is its #"pOH"#?
                                                                                                                  • Why aluminum alloy used in making aircraft body?
                                                                                                                  • Does HOF have hydrogen bonds?
                                                                                                                  • What quantity of heat in kj evolved when a 72.0g mixture containing equal parts of H2 and O2 by mass is burned?
                                                                                                                  • How would the percent yield be affected if the Na2CO3 was not throughly dried in the crucible before weighing?
                                                                                                                  • Concentrations of acids and bases?
                                                                                                                  • How do I do this? #DeltaH_(rxn) = -"2219.9 kJ/mol propane"#, so how much heat is released by combustion of #"16.50 kg propane"#?
                                                                                                                  • How to write an equation to show dissociation?
                                                                                                                  • Calculate the volume of 1 mole oxygen gas at 27 degree celcius and 4 atmosphere pressure. The molar volume of oxygen at NTP is 22.4 L/ mol?
                                                                                                                  • What is the molar mass of 31.3 g of gas exerting a pressure of 5.71 atm on the walls of a 3.04 L container at 297 K?
                                                                                                                  • What is the rate law equation for the following reaction (given the experimental data below)?
                                                                                                                  • How can you calculate mass by using volume and density?
                                                                                                                  • When 1414 J of heat energy is added to 38.7 g of ethanol, C2H6O, the temperature increases by 14.9 °C. Calculate the molar heat capacity of C2H6O?
                                                                                                                  • How many moles of hydrogen gas are contained in 21.3 L at stp?
                                                                                                                  • For a first order reaction if the time for 50%, 75% and 87.5% changes are t1, t2 and t3 respectively then what would be the value of t1: t2: t3 ?
                                                                                                                  • Which of the following is the buffer solution of strong acidic nature?
                                                                                                                  • Ionization help, please?
                                                                                                                  • Which of the two #O_2NCH_2CH_2O# or #CH_3CH_2O^-# is expected to be more stable and why?
                                                                                                                  • How do you balance this redox reaction?
                                                                                                                  • ) Explain the purpose of washing the sand with hot water. Why was it important to wash the sand with hot water? How would the experimental results be affected by washing the sand with cold water instead of hot water?
                                                                                                                  • How do I find the empirical formula of the product produced by heating 1 gram of Zinc Sulfur if i end up with 0,8375 grams of product ?
                                                                                                                  • For the ion #"NH"_4^+# the conductance at infinite dilution and 50deg c is 115. The equivalent conductance of #"NH"_4"NO"_3# at 50deg c and infinite dilution is 219. What is the conductance of the ion #"NO"_3^-# at 50deg c and infinite dilution?
                                                                                                                  • Why higher energy is required for stretching vibration as compared to the bending vibrantion?
                                                                                                                  • Consider the cell Cu/Cu^+2||Ag^+/Ag.If the concentration of Cu^+2 and Ag^+ ions becomes ten times, the emf of the cell is?
                                                                                                                  • Gaseous #HI# is synthesized from #H_2 (g)# and #I_2 (g)# at a temperature where #K_c = 1.00 xx 10^2#. Suppose that #HI# at #5.000 xx 10^(-1) atm#, #H_2# at #1.000 xx 10^(-2) atm#, and #I_2# at #5.000 xx 10^(-3) atm# are mixed in a #5#-#L# flask?
                                                                                                                  • C2H2 (20% H2SO4, / 1%Hg2+)= A. A(Zn-Pb /HCL(concentrate) = B identify the 'A ' & ' B'?
                                                                                                                  • Titrations with hydrated solutions Can anyone do it?
                                                                                                                  • Solve for Pressure (Ideal Gas Law)?
                                                                                                                  • If 0.248 mg of MgF2 is the maximum quantity that can be dissolved in 0.5 L of 0.1 Μ KF, what will be the Ksp of MgF2 under the same conditions?
                                                                                                                  • How many mole of water boild of produced by the reaction of a 3.5 moles of methane with excess oxygen?
                                                                                                                  • For the first order reaction A----> B+C carried out at 27°C if 3.8×10^-16 % of the reactant molecules exist in the activated state then what would be the activation energy of the reaction ?
                                                                                                                  • Is lead heavier than gold?
                                                                                                                  • Which is strongest lewis acid and why bf3 or bh2?
                                                                                                                  • A sample of gas contains 0.2000 mol of CH4(g) and 0.4000 mol of O2(g) and occupies a volume of 20.3 L. The following reaction takes place: CH4(g) + 2O2(g)CO2(g) + 2H2O(g) Calculate the volume of the sample after the reaction takes place in liters?
                                                                                                                  • Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 9.50 MJ of energy (in the form of heat) if the temperature of the sodium is not to increase by more than 10.0 °C? Use CP= 30.8 J/(K·mol)
                                                                                                                  • Why we take #"CaCO"_3# as standard to determine the hardness of water?
                                                                                                                  • Explain the different types of energy needed for different kinds of chemicals changes?
                                                                                                                  • 5C2O4 + 2MnO4 + 16H → 2Mn + 10CO2 + 8H2O If 4 mL of 0.001 Μ KMnO4 solution is used to reactcompletely with 250 mL of saturated CaC2O4 solution according to the above reaction, what will be the Ksp of CaC2O4 under the same conditions?
                                                                                                                  • Calculate the osmolarity if the 1L solution Containing ? 1. 10 mM albumin 2. 5mM NaCl
                                                                                                                  • If a sample of NH3 is found to contain 0.480 mol of N atoms, how many H atoms are present?
                                                                                                                  • Why nitrogen is lighter than oxygen? ?? while the vapour of oxygen us lighter than nitrogen? ?
                                                                                                                  • Find the PH [H+] of 6.0x10^-2?
                                                                                                                  • How many grams of Ca(OH)2, (mw=74) are there in 50 mL of a 3.0 N solution?
                                                                                                                  • How do I calculate the molarity and percentage of acetic acid in vinegar?
                                                                                                                  • What does 2.0g/87gmol-1 equal?
                                                                                                                  • What is meant by half life of a radioactive element is 30 seconds calculate the deccay constant?
                                                                                                                  • A recipe calls for 8.5g/L of Phytagel. How much Phytagel (a dry solid) woudl you need to add if you only needed to make 600mL? Thanks in advance!
                                                                                                                  • A scientist measures a substance to be 0.6 grams. Calculate the percent of error in the measurement. Show all work for full credit. What is the percent of error?
                                                                                                                  • How do you balance a chemical reaction such as photosynthesis ??????
                                                                                                                  • Can we recover bromine from sodium bromide (aq)+sodium acetate (aq) mixture?
                                                                                                                  • Why would all motion of atoms stop moving at zero kelvin?
                                                                                                                  • I need help with this Chemistry problem, how do I do this?
                                                                                                                  • 1 mole nitrogen gas and 3 moles hydrogen gas form .05 moles NH3 @ equilibrium. What is Kc of the reaction?
                                                                                                                  • Are gas molecules assumed to exert no forces of attraction or repulsion on each other?
                                                                                                                  • Explain why AsF5 does not follow the octet rule? How/why are there exceptions to the octet rule?
                                                                                                                  • What is the pH at 25 degrees Celsius of a 0.0064 M solution of a weak base with a Kb of 1.6E-9?
                                                                                                                  • What is the original molarity of a solution of a weak acid, given Ka and pH?
                                                                                                                  • The ionization energy of hydrogen is 13.6eV . What is the potential energy of the electron in n=2 state?
                                                                                                                  • What volume of 1.50M NaCl contains 3.40 moles of NaCl?
                                                                                                                  • How do we come to know which aldehyde is stronger reducing agent? methanal,ethanal,propanal,butanal
                                                                                                                  • A student used 25.0 mL of a stock solution of 2.00M MgSO4 to prepare a 0.200M solution. What is the final volume of the diluted solution?
                                                                                                                  • Can we tell from just the masses which of the two reactants will potentially be the limiting reagent? Why or why not? Keep in mind what is happening at the molecular level in a chemical reaction.
                                                                                                                  • Do all the molecules of a gas at a given temperature have the same kinetic energy?
                                                                                                                  • Consider the following reaction: 2NH3(g)-->N2(g)+3H2(g). A) Express the relative rate of the reaction with respect to each reactant and product. B)if the rate of production of H2 is 2.9•10^-6 Ms^-1 what is the rate of the reaction? Chemistry
                                                                                                                  • How long must a current of 2 amps run to liberate 2 moles of H2O when electrolyzed in the reaction below?
                                                                                                                  • How do you fine the MOLES of solute dissolved in a solution with only the concentration?
                                                                                                                  • A gaseous mixture consist of 6.91 grams of N2, 4.71 grams of O2 and 2.95 grams of He. What volume does this mixture occupy at 28 degree celcius and 1.05 atm pressure?
                                                                                                                  • What is the molecular formula of trichloroisocyanuric acid?
                                                                                                                  • A candle burning in a dark room is endothermic or exothermic process?
                                                                                                                  • The rate of hydrolosis of sucrose increases 4.1 times when the reaction temperature increases from 25°c to 35°c. Using this information (and appropriate assumptions) determine the energy of activation for the reaction. Please help?
                                                                                                                  • What the concentration of Mg in 5 moles of Mg(NO3)2.6H2O?
                                                                                                                  • Clara has a solution of potassium iodide in 2.0 L of water. She adds a small pinch of potassium iodide to the solution, and she observes it dissolving. Which term, if any, describes the solution?
                                                                                                                  • A gas has a pressure of 0.410 atm and a volume of 32 L. At what pressure would the volume of the gas change to 28L?
                                                                                                                  • [Equilibrium] Does my book contradict itself?
                                                                                                                  • The reaction 2A → A2​​​​​ was experimentally determined to be second order with a rate constant, k, equal to 0.0265 M–1min–1. If the initial concentration of A was 2.75 M, what was the concentration of A (in M) after 180.0 min?
                                                                                                                  • Sugar is soluble in water ,although sugar is a non-polar substance?why?!
                                                                                                                  • If 35 grams of ammonia are reacted with excess oxygen gas, how many liters of water vapor are formed?
                                                                                                                  • E value for the cell reaction Cu|Cu^2+(0.001M)||Cu^2+(0.1M)|Cu is?
                                                                                                                  • Why are organic reactions slower than most inorganic reactions?
                                                                                                                  • Would an electron have to absorb or release energy to jump from the second energy level to the third energy level?
                                                                                                                  • How to find solubility of a salt based on Ksp?
                                                                                                                  • When N2(g) reacts with H2(g) to form NH3(g) , 92.2 kJ of energy are evolved for each mole of N2(g) that reacts.?
                                                                                                                  • Hydrocarbons, compounds containing only carbon and hydrogen, are important in fuels. The heat of combustion of cyclopropane, C3H6, is 499.8 kcal/mol. ?
                                                                                                                  • A molecule of carbonic acid contains 3 atoms of oxygen for every 2 atoms of hydrogen. Could a compound containing 81 hydrogen atoms and 54 oxygen atoms be carbonic acid? Explain.
                                                                                                                  • What mass of oxygen is required to react completely with 1.20 mol of methane CH4?
                                                                                                                  • A 30kg sample of plutonium 239 will decay by 1180 years. What is the half life of plutonium 239?
                                                                                                                  • How is rate of reaction related to activation energy?
                                                                                                                  • The rate of diffusion of two gases are in the ratio of 2:3 then their corresponding densities are?
                                                                                                                  • What is the difference of a monosaccharide and disaccharide ?
                                                                                                                  • Why Mg2N2 is not possible?
                                                                                                                  • How many unpaired electrons are in manganese?
                                                                                                                  • Can someone help with this question?
                                                                                                                  • Why does egg float on the solution of salt and water?
                                                                                                                  • Partail pressure gas of mixture air in sea level .when you know?%78is nitrogen. %2is oxygen .%1is dioxide carbon
                                                                                                                  • How do you write a protocol for 400mL of 0.8M NaCl (FW NaCl = 58.44) ? Much appreciated!
                                                                                                                  • How to balance this chemical equation HCl (aq)+ CaCl (s)- CaCl(aq)+CO2(g)+H2O (1) ?
                                                                                                                  • A sample of concentrated nitric acid has a density of 1.41gmL and contains 70.0% HNO3 by mass. (a).what mass of HNO3 per liter of solution? (b).what is the molarity of the solution
                                                                                                                  • What happens when aluminum is added to sodium hydroxide?
                                                                                                                  • Do solids occupy space?
                                                                                                                  • How many grams of Calcium will be needed to produce 200 grams of Vanadium?
                                                                                                                  • Please I need to know what concentration of NaOH to add to butyric acid to get butyrate?
                                                                                                                  • Nitrous oxide (N2O) is used as an anesthetic. The pressure on 2.5L of N2O changes from 105 kPa to 40.5 kPa. If the temperature does not change, what will the new volume be?
                                                                                                                  • What are the magnetic quantum number(s) of #3d^5#?
                                                                                                                  • Calculate the pH of a saturated aqueous solution of #Co(OH)_3#(#K_(sp) = 2.7*10^(-43)#)?
                                                                                                                  • 100ml of 0.1 M HCl , 0.1 M KOH Were added till acid is 3/4 neutralized calculate concentration of salt formed?
                                                                                                                  • How do I estimate the difference from ph7.0 from NaCl ph12.51?
                                                                                                                  • Is CaO an alkali or a base?
                                                                                                                  • If radioactive elements start their half-life after the atoms are made through nuclear fusion in other stars, aren't scientists calculating the birth year of the atom instead of the birth year of Earth?
                                                                                                                  • What is the percent solution if 25mL of #CH_"3"OH# is DILUTED WITH 150mL with water?
                                                                                                                  • I need help to know if Ethanol has a melting point of -115c and a boiling point of 78c what state will it be at -20c?
                                                                                                                  • 0.1 mole of N2O4(g) was sealed in a tube under atmospheric conditions at 25° C. Calculate the number of moles of NO2(g) present, if the equilibrium #N_2O_4(g) rightleftharpoons 2NO_2(g)# (Kp = 0.14) is reached after some time ?
                                                                                                                  • Consider the reaction when aqueous solutions of sodium acetate and cobalt(II) bromide are combined. The net ionic equation for this reaction is?: label aq, s, l, or g
                                                                                                                  • If you make water particles absolutely still will they become a solid? and would their temperature change? Thank you!
                                                                                                                  • The following reaction has an equilbrium constant Kc =3.07e-4 at 24 degrees C. 2NOBr(g) <---> 2NO(g) + Br2(g) ?
                                                                                                                  • What is the concentration of ammonia in the solution?
                                                                                                                  • Why is it important to make sure all the NaHCO3 has reacted with the HCl before you stop adding acid ?
                                                                                                                  • Why there is no acidity above PH 10.3 ?
                                                                                                                  • Suppose you have a gas in a container being pressed down by a piston. The initial volume of the gas is 5.0 m3 and the pressure is 7.5 mmHg. If the volume decreases to 4.0 m3, what is the pressure? (The product of the volume and pressure remains constant.)
                                                                                                                  • What is the difference between an isotope and a radioisotope?
                                                                                                                  • What intermolecular forces are present in about boiling point?
                                                                                                                  • Determine the molecular formula of a compound that is 49.48%Carbon, 5.19% hydrogen, 28.85% nitrogen, and 16.48% oxygen? The molecular wight is 194.19g/mol.
                                                                                                                  • For the following reaction delta H = 2816 kJ. 6 CO2 (g) + 6 H2O (l) <---> C6H12O6 (s) + 6 O2 (g). What will be the effect on the equilibrium yield of C6H12O6 (s) if: ?
                                                                                                                  • A 10.2−g sample of dinitrogen monoxide is confined in a 5.74−L vessel. What is the pressure (in atm) at 125°C?
                                                                                                                  • What are 3 ways to increase solubility of a solid?
                                                                                                                  • You have 894 mL of chlorine trifluoride gas at 772 mmHg and 28°C. What is the mass (in g) of the sample?
                                                                                                                  • What is the maximum temperature of the water in the insulated container after the copper metal is added? (also steps on how to solve this problem please)
                                                                                                                  • Balance the equation: C3H8+O2=CO2+H2O?
                                                                                                                  • What do you mean by vanderwaal forces ?
                                                                                                                  • How many moles of cholesterol are represented by 2.05 * 10 ^7 molecules of cholesterol?
                                                                                                                  • Show the concentration of water in water is 55.56M. Hint: Start with the density of water?
                                                                                                                  • Why does C-N have a greater electron density than C-Cl?
                                                                                                                  • What are the reactants of NaCl ?
                                                                                                                  • What is the molar mass of adrenaline (C9H13NO3) ?
                                                                                                                  • What is the molar mass for Mn2O7, an oxide of manganese?
                                                                                                                  • One half of a mole of atoms would contain how many atoms?
                                                                                                                  • How do you find the number of neutrons in an element on the periodic table?
                                                                                                                  • How many formula units make up 31.8 g of magnesium chloride (MgCl2)?
                                                                                                                  • The Ksp of calcium hydroxide is 7.9*10^-6 find the pH of saturated solution of calcium hydroxide?
                                                                                                                  • Predict the formulas of the ionic compounds formed by the following elements nickel and sulfur?
                                                                                                                  • What substance is formed when magnesuim hydroxide reacts with hydrochloric acid???
                                                                                                                  • Calculate the mass of NaOH needed to make 250ml of 0.200 M aqueous solution?
                                                                                                                  • How many grams of V can be produced with 4.6 moles of V20S?
                                                                                                                  • 3.00 moles of gas are in a container with a volume of 60.0 liters and at a temperature of 400. K What is the pressure inside the container?
                                                                                                                  • Should I write #H_2SO_4# like a catalyst?
                                                                                                                  • What is the energy of a photon that has a wavelength of 9.0 m?
                                                                                                                  • From #PV = 1/3 mN<< upsilon^2 >>#, show that the kinetic energy for a mole of an ideal gas is #E_k = 3/2 RT#?
                                                                                                                  • What is the word equation for sodium chloride and sodium bicarbonate and water?
                                                                                                                  • How many moles of silver nitrate do 2.888x10^15 formula units equal?
                                                                                                                  • A mixture of calcium nitrate and sidium chloride ,does not react but a mixture of calcium nitrate and sodium carbonate,produces a white precipitate.What is that precipitate?
                                                                                                                  • Calculate the formal charge present in each atoms of ozone?
                                                                                                                  • If a reaction equation is balanced, then _____?
                                                                                                                  • Hi, could someone tell me if this is right and I set it up correctly? What mass of NaOH is needed to produce 400 g of a solution that is 12.0% by mass? Isn't it a mass solute/mass solution X 100? I set it up 12% 400/100 and got 48.0, is this correct?
                                                                                                                  • The sample now has a volume of 392 mL at a pressure of 0.987 atm and a temperature of 21oC. ?
                                                                                                                  • ) Explain two sources of error that may occur during the filtration process. For each source of error, explain how this error would affect the values of the mass % for each component. (Would the mass % be larger or smaller than the correct value?
                                                                                                                  • How can i solve this question ?
                                                                                                                  • Why AgNO3 is strong electrolyte?
                                                                                                                  • 300g of mg is burned on fire to produce magnesium oxide. final product weighs 4.97. what is the empirical formula for magnesium oxide?
                                                                                                                  • What will be the pH of a 0.02 M Ca(HCO)3 ?
                                                                                                                  • What will be the pOH of a 0.02 M of Ca(OH)2 ?
                                                                                                                  • Glass is prepared by hearing sand with limestone and washing soda 8. _SiO2(s) + _ CaCO3(s) CaSIO3(s) +Co2(g) ? 9. _ SiO2 (s) + _ Na2CO3(s) Na2SiO3 +_ CO2 (g) ?
                                                                                                                  • 2.0 grams of ZnSO4 reacts completely with Li2CO3; how many grams of Li2SO4 would be produced?
                                                                                                                  • Does 2-methyl-3-hexanone exhibit hydrogen bonding?
                                                                                                                  • Help answer this question Which is the best answer to complete the white areas or dashes?
                                                                                                                  • Using the Maxwell Boltzmann function. Calculate the fraction of argon gas molecules with a speed of 305m/s at 500K?
                                                                                                                  • What is incineration??
                                                                                                                  • What’s the molar mass of Freon, and what is the molecular formula (9.92% C, 58.6% Cl, and 31.8% F)?
                                                                                                                  • Write balanced equation for octane combustion. Cylinder is .5 L. Filled with air 45 degrees C at 1 atm. Air is 20% Oxygen. How many grams of octane need to react fully with oxygen?
                                                                                                                  • Two particles with charges #q_1# and #q_2# are separated by distance d. Rank these scenarios according to the magnitude of the electrostatic (coulombic) potential energy. Ignore sign. Rank from height to lowest energy?
                                                                                                                  • Why does ionization energy decrease as you move down a group in the periodic table?
                                                                                                                  • Hydrogen has two stable isotopes, and sulfur has four stable isotopes, and How many peaks would you observe in the mass spectrum of the positive ion of hydrogen sulfide (H2S)? Assume no decomposition of the ion into smaller fragments?
                                                                                                                  • Calculate the molar mass of Al(C2H3O2)3 ?
                                                                                                                  • Which Best describes the SI unit mole?
                                                                                                                  • A compound contains 2.8% Fe by mass.If the compound contains single Fe atom in its one molecule, then the molar mass(g/ml) of the compound is? (Fe=56 amu)
                                                                                                                  • The half-life of an isotope is 30sec. For a 1000g sample, what made of this isotope remains after 5.0 min?
                                                                                                                  • A 2.0 liter bottle can withstand a pressure of 5.0 atm. 120 mL of liquid ethanol, #"C"_2"H"_5"OH"#, (density 0.789 g/mL), is poured into the bottle and sealed. The bottle is heated to 100 C, changing all the liquid to gas. Will the bottle explode?
                                                                                                                  • How do I calculate the number of moles of acetic acid present in the aliquot (25mL of a 10% vinegar solution)?
                                                                                                                  • What element is this?? Cheap replacement for nitrogen gas to protect surfaces.
                                                                                                                  • A sample of oxygen is collected over water at 23°C and 770.0 mm Hg pressure. What is the pressure of the dry gas? (Vapor pressure of water at 23°C is 21.1 mm.)
                                                                                                                  • What kind of reaction is this 8 Fe + S₈ → 8 FeS ?
                                                                                                                  • What are the moles of substances present at equilibrium at #450^oC# if 1 mol #N_2# and 4 mol #H_2# in a 10 L vessel react according to the following equation? #N_2(g)# + #3H_2(g)# #rightleftharpoons# #2NH_3(g)#
                                                                                                                  • Why aren't the atomic masses of most elements whole numbers?
                                                                                                                  • The equilibrium constant Kc for the reaction is 3.8 10-5 at 727°C. What are Kc and Kp for the following equilibrium at the same temperature?
                                                                                                                  • Pure solids and liquids can be eliminated from the equilibrium constant expression because?
                                                                                                                  • What volume will the same gas occupy at 1.00 atm?
                                                                                                                  • Equation for questions 5-8: ___C3H8 + ___O2 à ___CO2 + ___H2O 5. How many moles of carbon dioxide will form if 8.5 moles of C3H8 is burned 6. If 15.0 moles of oxygen are used, how many grams of water will form? 7. If 200.0grams of C3H8 burns, how many
                                                                                                                  • A gas sample occupies volume of 2.5 L at a pressure of 1.5 atm. What would be the volume of gas if its pressure is reduced to 1 atm at the same temperature? Find the Given, UnknownLNDP/LSNF with a solution and answer. Thank you.
                                                                                                                  • When a certain 2.5-L vessel is filled with an unknown gas at STP, it weighs 2.75 g more than when it is evacuated. Determine the molar mass of the unknown gas?
                                                                                                                  • How many grams will be needed to produce 200 grams of Vanadium?
                                                                                                                  • You have a sample of material with the empirical formula of CH. The sample you have has a mass of 52.0g What is the molecular formula for the sample?
                                                                                                                  • You have a 500Kg sample of Magnesium Chloride (MgCl2). What is the amount of Chlorine present in the sample in grams?
                                                                                                                  • Given an aqueous solution in which the [H+] = 2.0 x 10-5 M, what is the molar hydroxide ion concentration?
                                                                                                                  • In the laboratory a student combines 39.3 mL of a 0.165 M manganese(II) chloride solution with 25.3 mL of a 0.328 M manganese(II) sulfate solution. What is the final concentration of manganese(II) cation ? M ?
                                                                                                                  • 12. When the vapor pressure of water is 30 kpa the temperature of the water is? A) 20 degrees celesius B) 100 degrees celesius C) 70 degrees celesius D) 40 degrees celesius
                                                                                                                  • Consider the neutralization reaction between CH3COOH and Sr(OH)2. Complete and balance the neutralization reaction, name the products, and write the net ionic equation.?
                                                                                                                  • If the energy of the reactant is greater than the energy of the product, will energy be released or absorbed by the reaction?
                                                                                                                  • How much heat in joules would you need to raise the temperature of 1 kg of water by 5°C?
                                                                                                                  • What best differentiate between real gases and ideal gases?
                                                                                                                  • How do I find the reaction potential of forming #"MgO"# and #"Zn"# from #"ZnO"# and #"Mg"#?
                                                                                                                  • We dissolve 0.500 g of an organic acid #C_6H_10O_4# in water and titrate the solution with 0.250 mol/L KOH. It takes 27.4 mL of KOH to neutralize the organic acid. It is a monoprotic or polytropic acid?
                                                                                                                  • Which of the compounds would you expect to have the highest melting point NaCl, H2Se, O2, H2O, H2S, CO2, MgO?
                                                                                                                  • Calculate the molar volume of 4.3 mole of oxygen?
                                                                                                                  • Write a balanced equation to show the reation of sulfurus acid with lithium hydroxide to form lithium sulfite and water ??
                                                                                                                  • How to calculate rate of dissolution?
                                                                                                                  • A dirty and impure sample that weighs 43.4 g contains a certain percentage of magnesium nitride. Magnesium nitride reacts with water.The sample is exposed to an excess of water to give 32.9 g Mg(OH)2. What percentage of Mg3N2is in the original sample?
                                                                                                                  • For the reaction: H2(g)+1/2O2(g)=H2O(g). The #DeltaH_(rxn)^@# = -241.8 Jmol ^-1 What quantity of heat, in kj, evolved when a 72.0 g mixture containing equal parts of H2 and O2, by mass, is burned?
                                                                                                                  • Chemistry help ASAP?
                                                                                                                  • How many moles of H are present in 1.70 moles of Benadryl?
                                                                                                                  • The value of the rate constant for the reaction between A & B was measured using pseudo-zeroth order conditions. The overall order of reaction was determined to be third order. When B was present at...?
                                                                                                                  • Find molarity of NaOH given the mass is 312g?
                                                                                                                  • Until roughly 1970, tritium (3H), a radioactive isotope of hydrogen, was a component of fluorescent watch dials and hands. For 3H, t1/2 = 12.3 yr. Assume you have such a watch. If a minimum of 14.0% of the original tritium is needed to read the dial in?
                                                                                                                  • When is extraction an appropriate technique for separation (e.g. is there an ideal sample size range, is there a minimum starting purity, what final purity should be expected, etc.)?
                                                                                                                  • How to determine moles in stoichiometric ?
                                                                                                                  • What is the ratio of pH of 0.1M H2SO4 and 0.1N H2SO4?
                                                                                                                  • What is the oxidation number of CuNO3?
                                                                                                                  • Phosphorus trichloride is a commercially important compound used in the manufacture of pesticides, gasoline additives, and a number of other products. It is made by direct combination of phosphorus and chlorine. How to answer the questions below?
                                                                                                                  • An ideal gas at #"155 kPa"# and #25^@ "C"# has an initial volume of #"1 L"#. The pressure of the ideal gas increases to #"605 kPa"# as the temperature is raised to #125^@ "C"#. What is the new volume?
                                                                                                                  • How do you calculate equilibrium concentrations of species when the concentration of one specie is unknown?
                                                                                                                  • S8 + 4 O2 = 8 SO If we started with 4.0 grams of Sulfur, how many moles of Sulfur Dioxide would be produced?
                                                                                                                  • Bromine has two isotopes bromine75=50.51% & bromine81=49.49% the average atomic mass of bromine is?
                                                                                                                  • The mass of aluminium in aluminium sulphate is 0.0675 g. Find the mass of sulphate?
                                                                                                                  • What is the equation for rate of reaction?
                                                                                                                  • How many grams of H2 are produced if 3.0 grams of Mg are reacted with excess HCI?
                                                                                                                  • What is the mass of acetic acid present in a sample that is titrated with 16.25 ml of 0.3015 M NaOH?
                                                                                                                  • 4 C3HsN309 (1) 12 CO2 (g) + 6 N2 (g) +10 H20 (g) + 02(g) What volume is occupied by all of the gases produced when 1.00 kg of nitroglycerin explodes? The total pressure is 1.54 atm at 423°C
                                                                                                                  • Determine the percent yield of reaction that produces 28.65g of FE when 50.00g Fe2O3 react with excess Al according to the following reaction. Give the anwers with four significant figures?
                                                                                                                  • Balance the following reaction? #(MnO_4^-) + C_2O_4^(2-) + H^(+) -> Mn^(2+) + CO_2 + H_2O#
                                                                                                                  • In excited state of carbon four valencies are not equivalent.could anybody explain it?
                                                                                                                  • What is the oxidation number of c in C6H12O4?
                                                                                                                  • What is the empirical formula if you have 42.07% sodium, 18.89% phosphorous, and 39.04% oxygen?
                                                                                                                  • A radioactive isotope of potassium (K) has a half-life of 20 minutes. If a 40.0 gram sample of this isotope is allowed to decay for 80 minutes, how many grams of the radioactive isotope will remain?
                                                                                                                  • Give the mass percent of oxygen in C14H19NO2?
                                                                                                                  • Why law of conservation of mass has to be obeyed during stoichiometry calculations?
                                                                                                                  • Why is HF acid so reactive, and why does sand dissolve in it rather than in any other solution?
                                                                                                                  • Identify the significant number of 0.0056?
                                                                                                                  • 2atm 20°c temperature 10g O2 volume 3.76 R value?
                                                                                                                  • How to determine whether a molecule is SC, FCC, or BCC?
                                                                                                                  • How many joules of heat must be added to a 2 kg sample of methanol for it to boil?
                                                                                                                  • If you have 16.8 L of gas at 1.0 atm, what is the new pressure if the volume is reduced to 15.0 L?
                                                                                                                  • Absorbance was monitored as a function of time during the course of a reaction. The product was produced from the reaction of two reactants; one of the reactants was present in a large enough concentration (0.2 M) that it can be considered to be a ?
                                                                                                                  • Oxalic acid is diprotic. What volume of 0.100M KOH is required to neutralize 25ml of 0.333M oxalic acid?
                                                                                                                  • The average molecular speed in a sample of CO2 gas at a certain temperature is 384 m/s. The average molecular speed in a sample of H2 gas is m/s at the same temperature.?
                                                                                                                  • What isotopes are created when you burn off potassium nitrate and sugar?
                                                                                                                  • A first order reaction has rate constants of #4.6xx"10"^(-2)" s"^(-1)"# and #8.1xx"10"^(-2)" s"^(-1)"# at 0 degrees Celsius and 20 degrees Celsius, respectively. What is the value of the activation energy?
                                                                                                                  • How to learn number of neutrons to take out mass of an element?
                                                                                                                  • What is the oxidation no. of MN in Mn²O³?
                                                                                                                  • What is the real life application of charle's law?
                                                                                                                  • 10 g of CH4a are allowed to react with 50g of oxygen.what is the limiting reactant which remains unreacted . calculate the mass of CO2 and H20?

Двадцатисемилетняя Кармен Хуэрта была поваром-кондитером в столовой АН Б. Бринкерхофф провел с ней наедине несколько приятных и, как ему казалось, тайных встреч в кладовке. Мидж злорадно подмигнула. - Никогда не забывай, Чед, что «Большой Брат» знает. Большой Брат.

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