A `4 : 1` molar mixture of `He` and `CH_(4)` is contained in a vessel at `20` bar pressure. Due to a hole in the vessel, the gas mixture leaks out. What is the composition of the mixture effusing out initially?

Explanation

To solve the problem of determining the composition of the gas mixture effusing out of a vessel containing a `4:1` molar mixture of `He` and `CH₄` at `20` bar pressure, we can follow these steps:

### Step 1: Understand the Mixture Composition
We have a mixture of helium (He) and methane (CH₄) in a molar ratio of `4:1`. This means for every 4 moles of He, there is 1 mole of CH₄.

- Let the total moles of the mixture be `5x` (where `x` is a common factor).
- Moles of He = `4x`
- Moles of CH₄ = `x`
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