Which of the following statements are true about effusion of gases. A. At the same temperature, lighter molecules move at a higher velocity than heavier ones.
B. Diffusion and effusion are similar because both involve the motion of gas molecules from
regions of higher concentration to lower concentration.
C. Effusion involves the movement of gas molecules through a small hole in a container.
D. According to Graham's Law, the relative rates of effusion of two gases is directly proportional
to the squares of their molar masses.