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Question:

A 15 g mass of nitrogen gas is enclosed in a vessel at a temperature 27°C. Amount of heat transferred to the gas, so that rms velocity of molecules is doubled, is about:

10 kJ

6 kJ

0.9 kJ

14 kJ

Solution:

Q=nCvΔT as gas in closed vessel
Q=15/28 ×5/2×R×(4T−T)
Q=10000J=10kJ