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Diffusion and Effusion

Diffusion and Effusion. The rates of diffusion and effusion depend on the relative velocities of the gas molecules. The faster the gas molecules are moving, the faster they diffuse/effuse. At the same temperature, molecules with a lower mass move faster than molecules with a higher mass.

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Diffusion and Effusion

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  1. Diffusion and Effusion

  2. The rates of diffusion and effusion depend on the relative velocities of the gas molecules. • The faster the gas molecules are moving, the faster they diffuse/effuse. • At the same temperature, molecules with a lower mass move faster than molecules with a higher mass.

  3. Graham’s Law of Effusion states that the rates of effusion of gases at the same temperature and pressure are inversely proportional to the square roots of their molar masses.

  4. Compare the rates of effusion of carbon dioxide and chlorine gases at the same temperature and pressure.

  5. A sample of hydrogen effuses about 6.5 times faster than an unknown gas. Estimate the molar mass of the unknown gas.

  6. A molecule of neon gas travels at 365 m/s at a given temperature and pressure. Calculate the average speed of a molecule of water vapor at the same temperature and pressure.

  7. An unknown gas effuses at half the speed of oxygen. What is the molar mass of the unknown gas? • If we can determine that the gas is either HBr or HI, which is it?

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