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First Law of Thermodynamics

Heat given to...

Question

Heat given to a system is 35 J and work done by the system is 15 J. The change in the internal energy of the system will be:

A

50 J

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B

20 J

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C

30 J

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D

40 J

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Solution

The correct option is B 20 J
According to the first law of thermodynamics,
$△ U = Q + W$
$= 35 - 15 = 20 J$

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First Law of Thermodynamics

Standard XIII Chemistry

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