The internal energy change when a system goes from state A to B is 40 kJ/ mol. If the system goes fr

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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, then what would be the net change in internal energy?

Accepted Answer

Internal energy is a state function.$\Delta U_{net} = \Delta U_{AB} + \Delta U_{BA} = \left( U_{B} - U_{A} \right) + \left( U_{A} - U_{B} \right) = 0$

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