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InterviewSolution
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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?A. zeroB. `40 kJ`C. `gt 40 kJ`D. `lt 40 kJ` |
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Answer» Correct Answer - A Internal energy is a state function. Thus, `Delta U = U_(f) - U_(i)` Since the system returns to its initial state, `U_(f) = U_(i)`. Hence, `Delta U = 0` It does not matter what path is followed. |
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