Gibbs Free Energy and Maximum Non-Expansion Work

Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$

Kaelie Blanes-Ronda 2L
Posts: 42
Joined: Fri Sep 29, 2017 7:07 am
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Gibbs Free Energy and Maximum Non-Expansion Work

How can I calculate the maximum nonexpansion work by using Gibbs Free Energy?

Varsha Swamy 2J
Posts: 14
Joined: Sat Jul 22, 2017 3:00 am

Re: Gibbs Free Energy and Maximum Non-Expansion Work

I found this from a previous CC post:

G is actually defined as the maximum non-expansion work under constant T and P. Non-expansion means not related to a volume change, for example, electrical work, which is also what we call "useful work". This can be proven mathematically using differentials, which we do NOT have to know for this class.

You can find the proof in the photo attached if you want to take a look.

They end up proving that dG < dw. Since work done by the system is negative, DeltaG < w indicates that Delta G is the maximum work that may be done.
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