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15 J of heat is supplied to a system and 15 J of work is done on the system, then the system is which of the following?

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15 J of heat is supplied to a system and 15 J of work is done on the system, then the system is which of the following?

(a) Steady state

(b) Unsteady state

(c) Closed

(d) None of the mentioned

The question was asked by my college professor while I was bunking the class.

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

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Correct choice is (b) Unsteady state

For explanation: ∆E = – 15 – 15 = – 30 J, which is not equal to zero, so the system is unsteady state system.

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