| Problem 1 |
State the Law of Combining Volumes and provide an example of your own construction which demonstrates this law. |
| Problem 2 |
Explain how the Law of Combining Volumes, combined with the Atomic-Molecular Theory, leads directly to Avogadro's Hypothesis that equal volumes of gas at equal temperatures and pressure contain equal numbers of particles. |
| Problem 3 |
Use Avogadro's Hypothesis to demonstrate that oxygen gas molecules cannot be monatomic. |
| Problem 4 |
The density of water vapor at room temperature and atmospheric pressure is 0.737 g/L. Compound A is 80.0% carbon by mass, and 20.0% hydrogen. Compound B is 83.3% carbon by mass and 16.7% hydrogen. The density of gaseous Compound A is 1.227 g/L, and the density of Compound B is 2.948 g/L. Show how these data can be used to determine the molar masses of Compounds A and B, assuming that water has molecular mass 18. |
| Problem 5 |
From the results above, determine the mass of carbon in a molecule of Compound A and in a molecule of Compound B. Explain how these results indicate that a carbon atom has atomic mass 12. |
| Problem 6 |
Explain the utility of calculating the number of moles in a sample of a substance. |
| Problem 7 |
Explain how we can conclude that 28 g of nitrogen gas (N2) contains exactly as many molecules as 32 g of oxygen gas (O2), even though we cannot possibly count this number. |
Molecules 
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