The internal energy change when a system goes P from state \( A \) ...

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The internal energy change when a system goes
P from state \( A \) to \( B \) is \( 40 \mathrm{~kJ} / \mathrm{mol} \). If the system

W goes from \( A \) to \( B \) by a reversible path and returns to state \( A \) by an irreversible path, then what would be the net change in internal energy?
(1) \( 40 \mathrm{~kJ} \)
(2) \( 40 \mathrm{~kJ} \)
(3) \( 40 \mathrm{~kJ} \)
(4) Zero
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