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15 J of heat is supplied to a system and system does 5 J of work, what is the change in internal energy?

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15 J of heat is supplied to a system and system does 5 J of work, what is the change in internal energy?

(a) 5 J

(b) 10 J

(c) 15 J

(d) 20 J

I got this question in examination.

My question is from Energy Balances for Closed, Unsteady-State Systems in section Introduction to Energy Balances for Processes without Reaction and Calculation of Enthalpy Changes of Basic Chemical Engineering

1 Answer

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Best answer
Right choice is (b) 10 J

Explanation: ∆U = 15 – 5 = 10 J.

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