## Gibbs free energy equations

$\Delta G^{\circ}= \Delta H^{\circ} - T \Delta S^{\circ}$

$\Delta G^{\circ}= -RT\ln K$

$\Delta G^{\circ}= \sum \Delta G_{f}^{\circ}(products) - \sum \Delta G_{f}^{\circ}(reactants)$

J_CHEN 4I
Posts: 54
Joined: Tue Nov 14, 2017 3:01 am

### Gibbs free energy equations

Can all the gibbs free energy equations be used for electrochemistry problems?

Eugene Chung 3F
Posts: 142
Joined: Wed Nov 15, 2017 3:03 am

### Re: Gibbs free energy equations

I think the main thing to remember is deltaG = 1nFEcell. You can use any equation to find delta G then, apply this equation to find electrochemical variable values or vice versa.

Justin Quan 4I
Posts: 104
Joined: Sat Sep 14, 2019 12:17 am

### Re: Gibbs free energy equations

To add on, for most electrochemistry problems, you will have to use some form of ∆G = -nFE˚. However, you might have to relate the equilibrium constant K to the system of a electrochemical cell, in which use ∆G = -RTlnK.

Kylie Lim 4G
Posts: 110
Joined: Sat Aug 17, 2019 12:15 am

### Re: Gibbs free energy equations

I think you should be able to use all of the methods for finding gibbs free energy, just make to differentiate between gibbs free energy and standard gibbs free energy

Kallista McCarty 1C
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Joined: Wed Sep 18, 2019 12:18 am

### Re: Gibbs free energy equations

I think the most common will be ∆G = -nFE˚ which is also equal to the maximum work

AlyshaP_2B
Posts: 112
Joined: Wed Sep 18, 2019 12:19 am

### Re: Gibbs free energy equations

You mostly will need to use ∆G = -nFE˚and ∆G = -RTlnK, and sometimes a combination of both depending on what the question is asking.