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5 J of work is done by the system, if the change in internal energy of the system is 10 J, what is the heat supplied to the system?

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5 J of work is done by the system, if the change in internal energy of the system is 10 J, what is the heat supplied to the system?

(a) – 5 J

(b) 5 J

(c) – 15 J

(d) 15 J

The question was posed to me in semester exam.

The origin of the question is Energy Balances for Closed, Unsteady-State Systems topic in division Introduction to Energy Balances for Processes without Reaction and Calculation of Enthalpy Changes of Basic Chemical Engineering

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The correct answer is (d) 15 J

For explanation: 10 = – 5 + Q, => Q = 15 J.

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