## Example 14.3 moles confusion? (Not HW question, example.)

Josiah Chung 1G
Posts: 16
Joined: Fri Sep 25, 2015 3:00 am

### Example 14.3 moles confusion? (Not HW question, example.)

In example 14.3 the question states:

"The potential of the Daniell cell for the solutions of 1.00mol/L copper and zinc ions is +1.04V/ What is the reaction Gibbs free energy for this cell?"

When the problem is set up they use the equation G = -nF(Ecell). E is 1.04, and F is the constant, but why does the example plug in a 2 for the value of moles to solve for the Gibbs free energy?

KVu 3G
Posts: 12
Joined: Fri Sep 25, 2015 3:00 am

### Re: Example 14.3 moles confusion? (Not HW question, example.

n is the number of moles of electrons transferred. When the redox reaction between zinc and copper are balanced there are 2 moles of electrons transferred.

$Zn \rightarrow Zn^{2+} + 2e^{-}$
$Cu^{2+} + 2e^{-}\rightarrow Cu$