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### Spontaneity in a cell reaction

Posted: Sun Mar 18, 2018 5:05 am
What can the relation between Ecell and delta G tell me about whether a cell reaction is spontaneous?

### Re: Spontaneity in a cell reaction

Posted: Sun Mar 18, 2018 5:25 am
I'm pretty sure delta G alone can tell you if the reaction is spontaneous. If delta G is positive, then the reaction is non-spontaneous. If delta G is negative, then the reaction is spontaneous.

I'm not sure if I answered what you were looking for, but I hope this helps!

### Re: Spontaneity in a cell reaction

Posted: Sun Mar 18, 2018 5:30 am
However, if you didn't know either delta G or Ecell, then you can use the equation $\Delta G = -nFE^{\circ}$
to find tif you know the other one.

### Re: Spontaneity in a cell reaction

Posted: Sun Mar 18, 2018 10:04 am
Based on the equation Matt gave, if Ecell is positive, Delta G is negative = spontaneous. If Ecell is negative, Delta G is positive = nonspontaneous.

### Re: Spontaneity in a cell reaction

Posted: Sun Mar 18, 2018 5:12 pm
dG=-nFE
E is standard cell potential that needs to be positive so that dG could be negative, which is what we want for spontaneity