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What is the heat transferred for a 10 mole unsteady state closed system, if initial internal energy is 6 J/mole and final internal energy is 10 J/mole?

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What is the heat transferred for a 10 mole unsteady state closed system, if initial internal energy is 6 J/mole and final internal energy is 10 J/mole?

(a) 4 J

(b) 10 J

(c) 40 J

(d) 60 J

This question was posed to me in an online quiz.

My question is based upon Energy Balances Application in Processes in portion Energy Balances that Include the Effects of Chemical Reaction, Ideal Processes, Efficiency and the Mechanical Energy Balance and Heats of Solution and Mixing of Basic Chemical Engineering

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Right answer is (c) 40 J

To explain I would say: Q = Uf – Ui = 10(10 – 6) = 40 J.

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