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10 J of heat is taken off from a steady state system, what is the work done on the system?

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10 J of heat is taken off from a steady state system, what is the work done on the system?

(a) – 10 J

(b) 10 J

(c) – 5 J

(d) 5 J

This question was addressed to me in a national level competition.

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

1 Answer

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Best answer
Right choice is (b) 10 J

The best explanation: 0 = – 10 + W, => W = 10 J.

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