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What is the heat transferred for a 10 mole unsteady state closed system, if a change in internal energy is 5 J/mole?

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What is the heat transferred for a 10 mole unsteady state closed system, if a change in internal energy is 5 J/mole?

(a) 5 J

(b) 10 J

(c) 50 J

(d) 100 J

The question was posed to me during an interview for a job.

I'm obligated to ask this question of Energy Balances Application in Processes topic in division 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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Correct choice is (c) 50 J

To explain I would say: Q = ∆U = 10*5 = 50 J.

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