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### reversible/irreversible

Posted: Sun Mar 11, 2018 1:48 am
can anyone explain the difference between reversible and irreversible expansion? are there specific formulas for each conditions?

### Re: reversible/irreversible

Posted: Sun Mar 11, 2018 3:03 am
The difference is that during a reversible process, the system will always be at equilibrium with its surroundings. For an irreversible process, there will always be an entropy change.

### Re: reversible/irreversible

Posted: Sun Mar 11, 2018 9:21 am
There are a couple formulas for work that differ based on if a reaction is undergoing reversible or irreversible expansion. If the reaction is reversible, then use w=-nRTln(Vfinal/Vinitial), where T is the absolute temperature. When a reaction is irreversible and the external pressure is constant, then use w=-Pex$\Delta$V.