20 mL of hydrogen gas at `15^@C` is heated to `35^@C` at constant pressure . Find the new volume of hydrogen.

Explanation

To solve the problem of finding the new volume of hydrogen gas when it is heated from 15°C to 35°C at constant pressure, we will use Charles's Law. Charles's Law states that the volume of a gas is directly proportional to its absolute temperature (in Kelvin) when pressure is held constant.

### Step-by-Step Solution:

1. **Identify the given values:**
- Initial volume (V1) = 20 mL
- Initial temperature (T1) = 15°C
- Final temperature (T2) = 35°C
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