First slide

Internal energy and internal energy change

Question

The internal energy change when a system goes from state A to B is 40 KJ/mole. 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 ?

Easy

A

40 KJ
B

> 40KJ
C

< 40KJ
D

Zero

Solution

It is a cyclic process and internal energy is a state function, $∆ E = 0;$

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