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- 1. Multiple ChoiceThe rate of effusion is _______________ proportional to the square root of its' molar mass.DirectlyInversely
- 2. Multiple ChoiceLighter gases have a ________________ rate of effusion.fasterslowerrate of effusion does not depend on mass.
- 3. Multiple ChoiceWhich of the following would have a faster rate of effusion: 15g of Kr or 15g of N2?KyrptonNitrogenBoth would have the same rate of effusion
- 4. Multiple ChoiceEffusion isused to describe the combustibility of a gas.ability of a gas to escape through a tiny openingwhat occurs after diffusion.the ability of a gas to mix with other gases.
- 5. Multiple ChoiceThe rate of effusion of water vapor is 0.391 and the rate of effusion of propane is 0.251 at the same temperature and pressure. What is the molar mass of propane? (write the formula and show your work)44.0 g/mol6.63 g/mol0.37 g/mol28.2 g/mol
- 6. Multiple Choice
Identify the factor that determines rates of diffusion and effusion for different molecules at a given temperature.
Size of the molecules
Polarity of the molecules
Temperature of the gas
Molar mass of the gas
- 7. Multiple Choice
Effusion and diffusion rates are inversely proportional to the square root of the molar mass of the gas.
True
False
- 8. Multiple Choice
Grahams law refers specifically to
the rate of diffusion
the rate of effusion
the temperature of gases
the partial and total pressures of gases in a sample.
- 9. Multiple Choice
why would O2 effuse faster than CO2 in the same room
because O2 has more energy
because CO2 has a greater molar mass
because oxygen has a higher temperature
they will effuse the same because the temperature is fixed
- 10. Multiple ChoiceWhich of the following gases will effuse most slowly under the same physical conditions?
Don't forget to check for diatomics!HydrogenChlorineAmmonia (NH3)Bromine - 11. Multiple ChoiceUse Graham’s Law to calculate fast O2 gas will effuse compared to Cl2.O2 effuses 1.5x faster than Cl2O2 effuses 0.11x as fast as Cl2O2 effuses 1.1x faster than Cl2O2 effuses 0.15x as fast as Cl2
- 12. Multiple ChoiceAn unknown gas diffuses 0.25 times as fast as helium gas (He). What is the molecular mass of the unknown gas?64 g/mol16 g/mol32 g/mol4 g/mol
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