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The pressure of given mass of a gas in a thermodynamic system is changed in such a way that 20 joule of heat is released from the gas and 8 joule of work is done on the gas. If the initial internal energy of the gas was 30 joule then final internal energy will be

A

2 J

B

42 J

C

18 J

D

58 J

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The correct Answer is:
C
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