What volume of air will be expelled from a vessel containing `400 cm^(3)` at `7^(@)C` when it is heated to `27^(@)C` at the same pressure?

Explanation

To solve the problem of finding the volume of air expelled from a vessel when it is heated from 7°C to 27°C at constant pressure, we can use the relationship between volume and temperature for an ideal gas, which is given by Charles's Law.

### Step-by-Step Solution:

1. **Convert Temperatures to Kelvin:**
- The temperature in Kelvin (K) is calculated by adding 273 to the Celsius temperature.
- \( T_1 = 7°C + 273 = 280 \, K \)
- \( T_2 = 27°C + 273 = 300 \, K \)
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