1. Diffusion and Effusion
Section 4 Diffusion and Effusion
Chapter 11
Diffusion and Effusion
Diffusion - gradual mixing of two or more gases due to their spontaneous, random motion
Effusion - molecules of a gas confined in a container randomly pass through a tiny opening in the container.

2. Comparing Diffusion and Effusion
Visual Concepts
Chapter 11
Comparing Diffusion and Effusion
Click below to watch the Visual Concept.
Visual Concept

3. Graham’s Law of Effusion
Section 4 Diffusion and Effusion
Chapter 11
Graham’s Law of Effusion
Graham’s law of effusion - the rates of effusion of gases at the same temperature and pressure are inversely proportional to the square roots of their molar masses.

4. Graham’s Law of Effusion
Visual Concepts
Chapter 11
Graham’s Law of Effusion
Click below to watch the Visual Concept.
Visual Concept

5. Section 4 Diffusion and Effusion
Chapter 11
Graham’s Law

6. Graham’s Law of Effusion
Section 4 Diffusion and Effusion
Chapter 11
Graham’s Law of Effusion
Sample Problem J
Compare the rates of effusion of hydrogen and oxygen at the same temperature and pressure.