Moles in Galvanic Cell

[Nicole Gamboa 2M]

Hi All,
I was doing some of the homework problems about calculating the standard reaction Gibbs free energy for cell reactions and I was confused about how to calculate the moles when using the equation deltaG=-nFEcell. Do you have to go through the half-reactions to find out how many electrons were needed even though the equation is already balanced?
Thanks!

[Sunny Chera 1N]

Yeah so you have to derive the two half-reactions from the skeletal equation, and from those two half-reactions, you can determine the number of moles of electrons you need to use for that equation. For example, if you have Zn(s) getting oxidized at the anode and Cu2+ ions getting reduced at the cathode into Cu(s) then you would plug in 2 moles of electrons into that equation for n. Hopes this helps!

[204929947]

Im still confused on how to find out the moles. Do you set up the equation and then figure out how many electrons are used? I'm confused while doing the HW question 14.9 6th Edition