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10 J of heat and 5 J of work are supplied to the system, what is the change in internal energy?

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10 J of heat and 5 J of work are supplied to the system, what is the change in internal energy?

(a) 5 J

(b) 10 J

(c) 15 J

(d) 20 J

I got this question in homework.

This is a very interesting question from Energy Balances for Closed, Unsteady-State Systems in portion Introduction to Energy Balances for Processes without Reaction and Calculation of Enthalpy Changes of Basic Chemical Engineering

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Best answer
Correct choice is (c) 15 J

For explanation: ∆U = 5 + 10 = 15 J.

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