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Questions  

Find the change in internal energy of the system when a system absorbs 2 kilocalorie of heat and at the same time does 500 joules of work

a
7900 J
b
8200 J
c
5600 J
d
6500 J

detailed solution

Correct option is A

dQ= dU +dw or    dU=dQ−dW               =2×103×4⋅2 joule −500 joule =7900J

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