Question

as molecular weight increases, multiple choice the rate of diffusion remains unchanged. the rate of diffusion increases at first, then slows down. the rate of diffusion increases. the rate of diffusion decreases.

Explanation:

According to Graham's law of diffusion, the rate of diffusion of a gas is inversely proportional to the square - root of its molar mass (molecular weight). So, as molecular weight increases, the rate of diffusion decreases.

Answer:

the rate of diffusion decreases.