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The internal energy change in a system that has absorbed 2kcal of heat and done 500 J of work is?

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The internal energy change in a system that has absorbed 2kcal of heat and done 500 J of work is?

(a) 6400 J

(b) 5400 J

(c) 7900 J

(d) 8900 J
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Correct option is (c) 7900 J

Explanation: As Q=∆U+W

∆U=Q-W=2×4.2×1000-500

∆U=8400-500=7900 J.
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