CHEM 103 Chapter Notes - Chapter 8: Boiling Point, Ideal Gas, Molar Mass
24 Oct 2016
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Textbook chapter 8, sections 8. 4, 8. 6 (skip 8. 6. a), & 8. 8. 8. 4: gas density, molar mass, and the ideal gas law. The ideal gas law can be used to relate gas density to molar mass. Once t(temperature) and p(pressure) are specified, the density of a gas can be found using ideal gas law. Because equal volumes of gas at the same t and p contain equal numbers of molecules, the densities of different gases are directly proportional to their molar masses. To derive the relationship between gas density and molar mass: For any substance: the amount (n) equals the mass (m) divided by the molar mass (m) Thus, the density of a gas is directly proportional to its molar mass, m. Partial pressure = the pressure that one gas in a mixture of gases would exert if it occupied the same volume by itself (at the same t and n)
