Graham's Law of Effusion

Use Graham’s Law to calculate fast O₂ gas will effuse compared to Cl₂.

• O₂ effuses 1.5x faster than Cl₂

• O₂ effuses 0.11x as fast as Cl₂

• O₂ effuses 1.1x faster than Cl₂

• O₂ effuses 0.15x as fast as Cl₂

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.

According to Graham's Law, if the molar mass of gas A is 9 g/mol and the molar mass of gas B is 36 g/mol, what is the ratio of their rates of diffusion?

• 1:2

• 2:1

• 1:3

• 3:1

What is effusion in the context of gases?

• The process by which gas particles spread through a mixture

• The process by which gas particles pass through a tiny opening

• The process by which gas particles condense into a liquid

• The process by which gas particles exert pressure on the walls of their container

What is the main difference between diffusion and effusion?

• Diffusion involves gas particles moving through a tiny opening, while effusion involves spreading in a mixture.

• Effusion involves gas particles moving through a tiny opening, while diffusion involves spreading in a mixture.

• Diffusion can only occur in liquids, while effusion can occur in gases.

• Effusion can only occur in liquids, while diffusion can occur in gases.

If the molar mass of gas 1 is 4.0 grams per mole and the molar mass of mass 2 is 10.0 grams per mole, what is the ratio of their speeds of diffusion?

• 1.6:1

• 2.5:1

• 25:1

• 0.0253:1

Lighter gases have a ________________ rate of effusion.

• faster 

• slower

• rate of effusion does not depend on mass.

Which of the following would have a faster rate of effusion?

• Helium

• Hydrogen

• Nitrogen

•     Oxygen

Which of the following gases will effuse most slowly under the same physical conditions?
Don't forget to check for diatomics!

• Hydrogen

• Chlorine

• Ammonia (NH₃)

• Bromine

How much faster will gaseous hydrogen effuse than gaseous chlorine under the same physical conditions?

• 5.92

• 5.95

• 0.03

• 1.00