A vessel of capacity `400 cm^(3)` contains hydrogen gas at 1 atm pressure at `7^(@)C`. In order to expel `28.57 cm^(3)` of the gas at the same pressure, to what temperature the vessel should be heated ?

Explanation

To solve the problem, we will use the ideal gas law and the relationship between volume and temperature at constant pressure.

### Step-by-Step Solution:

1. **Identify Given Values**:
- Initial volume of gas (V1) = 400 cm³
- Volume of gas to be expelled = 28.57 cm³
- Final volume of gas (V2) = V1 - Volume expelled = 400 cm³ - 28.57 cm³ = 371.43 cm³
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