An unknown gas diffuses four times as quickly as oxygen. Calculate the molar mass of the gas.

Explanation

To solve the problem of finding the molar mass of an unknown gas that diffuses four times faster than oxygen, we can use Graham's law of effusion. Here's a step-by-step solution:

### Step 1: Understand Graham's Law of Effusion
Graham's law states that the rate of diffusion of a gas is inversely proportional to the square root of its molar mass. Mathematically, it can be expressed as:
\[ \frac{R_1}{R_2} = \sqrt{\frac{M_2}{M_1}} \]
where:
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