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

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