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Q.

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

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a

40 kJ 

b

> 40 kJ

c

< 40 kJ

d

Zero

answer is D.

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Detailed Solution

change in internal energy is a statefunction

thermodynamic property which depends on initial and final state but not on path followed is a statefunction

since the system returns to initial path Uf = Ui

∆U = Uf -Ui = 0

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