Question

Rate of diffusion of a gas is:

• A. directly proportional to its density.
• B. directly proportional to its molecular weight.
• C. directly proportional to the square root of its molecular weight.
• D. inversely proportional to the square root of its molecular weight.

Answer 1

The correct option is D inversely proportional to the square root of its molecular weight.

Rate of diffusion of a gas is Inversely proportional to the square root of its molecular weight.
Thus, rate of diffusion, $r=\alpha \frac{1}{\sqrt{M}}$.