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

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Find the change in internal energy of the system when a system absorbs 2 kilocalorie of heat and at the same time does 500 joule of work
A. 6400J
B. 8200J
C. 5600J
D. 7900J
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Correct Answer - D
`dQ=2000xx4.2J`
=8400 J
dW=500J
`dU=8400-500`
`=7900J`
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