1.40L of an unknown gas requires 57 second to diffuse and the same volume of `N_(2)` gas takes 84 second to diffuse at the same temperature and pressure. What is the molecular mass of the unknown gas?

Explanation

To find the molecular mass of the unknown gas using the information provided, we will apply Graham's Law of Diffusion. Here’s a step-by-step solution:

### Step 1: Understand Graham's Law of Diffusion
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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