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A rigid closed vessel contains a gas at pressure 57 cm Hg at 40 degrees C. The vessel is then heated to 80 degrees C. What is the final pressure of the gas (in cm Hg)?

1. 57 cm Hg
2. 62.6 cm Hg
3. 65.0 cm Hg
4. 68.4 cm Hg

Correct answer: 65.0 cm Hg

Solution

At constant volume, P/T = constant. Converting to Kelvin: T1 = 313 K, T2 = 353 K. P2 = 57 * 353 / 313 = 64.3 cm Hg, which is closest to 65.0 cm Hg.

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