A vessel contains 5 mole of O2 . The system is given heat at constant pressure. As a result the gas expands and does 120 joule work. Heat given to the gas is:

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310 J

390 J

420 J

560 J

answer is C.

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Detailed Solution

W=nR∆T=120, Q=nCP∆T=n72R∆T=72W=72×120=420 J.

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