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5 Kg of steam is enclosed in a container with internal energy = 10 J/Kg, then 25 J of heat is supplied to the system, what is the final internal energy?

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5 Kg of steam is enclosed in a container with internal energy = 10 J/Kg, then 25 J of heat is supplied to the system, what is the final internal energy?

(a) 5 J/Kg

(b) 10 J/Kg

(c) 15 J/Kg

(d) 20 J/Kg

I got this question in an online quiz.

The query 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

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Right answer is (b) 10 J/Kg

Best explanation: 25 = 5(U – 10), => U = 15 J/Kg.

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