A gas cylinder contains oxygen gas at `25^@C` and 15.0 atm. If the temperature of the surroundings rises to `42^@C`, what would be the pressure of the gas in the cylinder ?

Explanation

To solve the problem of finding the pressure of oxygen gas in a cylinder when the temperature changes, we can use the relationship between pressure and temperature for a gas at constant volume. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Identify Given Values:**
- Initial Pressure (P1) = 15.0 atm
- Initial Temperature (T1) = 25 °C
- Final Temperature (T2) = 42 °C
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