### Spontaneity in a cell reaction

Posted:

**Sun Mar 18, 2018 5:05 am**What can the relation between E

_{cell}and delta G tell me about whether a cell reaction is spontaneous?Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=141&t=30363

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Posted: **Sun Mar 18, 2018 5:05 am**

What can the relation between E_{cell} and delta G tell me about whether a cell reaction is spontaneous?

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!

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

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

to find tif you know the other one.

to find tif you know the other one.

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.

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

E is standard cell potential that needs to be positive so that dG could be negative, which is what we want for spontaneity