Reversible vs Irreversible Expansion

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Nathaniel 2E
Posts: 27
Joined: Mon Jun 25, 2018 3:00 am

Reversible vs Irreversible Expansion

Postby Nathaniel 2E » Sun Feb 03, 2019 4:44 pm

I'm not exactly sure on the meaning of reversible and irreversible reactions- how are they different and how can you tell if the problem doesn't specify? In question 8.11 from the 6th edition, irreversible expansion work is modeled by -P(deltaV) and reversible -nRTln(V2/V1) why do we use different equations for the two different expansions?

Hovik Mike Mkryan 2I
Posts: 95
Joined: Fri Sep 28, 2018 12:25 am

Re: Reversible vs Irreversible Expansion

Postby Hovik Mike Mkryan 2I » Sun Feb 03, 2019 4:53 pm

Hello, the way I remember is by that irreversible expansion has constant pressure, therefore you can take out -P and multiply with Vfinal-Vinitial. For reversible reactions the pressure is not constant and the second equation takes that into account. Hope this helped!

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