The rate of diffusion of a gas is

Options

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

Explanation

To solve the question regarding the rate of diffusion of a gas, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Graham's Law of Effusion/Diffusion**:
Graham's law states that the rate of diffusion of a gas is inversely proportional to the square root of its molar mass (or molecular weight). This means that lighter gases diffuse faster than heavier gases.

2. **Write the Mathematical Expression**:
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