The internal energy change when a system goes fromk state `A` to `B` is `40 kJ mol^(-1)`. 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?

Options

A. 40 kJ
B. `gt 0 kJ`
C. `lt 40 kJ`
D. zero

Answer

D

Explanation

Change in internal energy in a cyclic process is zero whether the process is reversible or irreversible.