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Q.

The internal energy change when a system goes from state A to B is 40 kJ mol−1. If the system goes from A to B by a reversible and returns to state A by irreversible path what would be the net change in internal energy?

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a

Zero

b

40 kJ mol−1

c

>40 kJ mol−1

d

<40 kJ mol−1

answer is A.

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Detailed Solution

Since the internal energy is a state function, dU=0. 

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