A certain quantity of heat energy is given to a diatomic ideal gas which expands at constant pressure. The fraction of the heat energy that is converted into work is:

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2/3

2/7

1/5

1/7

answer is B.

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Detailed Solution

WQ=WW+∆U=nR∆TnR∆T+nCV∆T=nR∆TnR∆T+nCV∆T=nR∆TnR∆T+n52R∆T=27

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