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(D) Internal energy $(U)$ is a state function.$A$ state function depends only on the initial and final states of the system,not on the path taken.For

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(D) Internal energy $(U)$ is a state function.$A$ state function depends only on the initial and final states of the system,not on the path taken.For any cyclic process,where the system returns to its initial state,the total change in the state function is always zero.Since the system starts at state $A$,goes to state $B$,and returns to state $A$,the net change in internal energy $\Delta U_{net} = U_{final} - U_{initial} = U_A - U_A = 0$.

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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