Understanding Gas Diffusion Concepts

What is Graham's Law of Effusion?

• The rate of effusion of a gas is inversely proportional to the square root of its molar mass.

• The rate of effusion of a gas is directly proportional to its molar mass.

• The rate of effusion of a gas is inversely proportional to its pressure.

• The rate of effusion of a gas is directly proportional to its temperature.

Which of the following factors does NOT affect the rate of gas diffusion?

• Temperature

• Molar mass

• Volume of the container

• Concentration gradient

Differentiate between diffusion and effusion.

• Diffusion is the movement of gas particles through a small hole, while effusion is the mixing of gas particles in a container.

• Diffusion is the mixing of gas particles in a container, while effusion is the movement of gas particles through a small hole.

• Diffusion and effusion are the same processes.

• Diffusion occurs only in liquids, while effusion occurs only in gases.

• 4

• 2

Which of the following is an application of gas diffusion?

• Separation of isotopes

• Determining the boiling point of a liquid

• Measuring the viscosity of a liquid

• Calculating the density of a solid

Explain why lighter gases diffuse faster than heavier gases.

• Lighter gases have higher kinetic energy.

• Lighter gases have lower molar mass, leading to higher speeds at the same temperature.

• Lighter gases have stronger intermolecular forces.

• Lighter gases have higher pressure.

A gas diffuses through a porous barrier in 30 seconds. A second gas takes 60 seconds to diffuse through the same barrier. What is the molar mass ratio of the second gas to the first gas?

• 1:2

• 2:1

• 1:4

• 4:1

Discuss the impact of temperature on the rate of gas diffusion.

• Higher temperature decreases the rate of diffusion.

• Higher temperature increases the rate of diffusion.

• Temperature has no effect on the rate of diffusion.

• Temperature only affects diffusion in liquids, not gases.

A mixture of helium and argon gases is allowed to effuse through a small opening. Which gas will effuse faster and why?

• Helium, because it has a lower molar mass.

• Argon, because it has a higher molar mass.

• Helium, because it has a higher molar mass.

• Argon, because it has a lower molar mass.

• 14 g/mol

• 28 g/mol

• 42 g/mol

• 56 g/mol