[skibum143]

(a) The following standard redox couples are connected to make a galvanic cell at 25 °C.
1)   Sn2+/Sn(s)    E1o = -0.14
2)   Al3+/Al(s)    E2o = -1.66

Which couple (1 or 2) is the cathode couple, and how many electrons are transferred in the balanced cell reaction?
- I thought 1 was the cathode because it has a less negative E0, and I thought 3 electrons were transfered away from Al. This is wrong, not sure why.

What is the standard cell potential?
1.52V, this is right

What is Go for the cell reaction?
-I thought Go = -nFE0 = -(3/2)(96485.34)(1.52) = -219986.58, but this is wrong


The following standard redox couples are connected to make a galvanic cell at 25 °C.
1)   Ni2+/Ni(s)    E1o = -0.25
2)   Au3+/Au(s)    E2o = 1.50

Which couple (1 or 2) is the cathode couple, and how many electrons are transferred in the balanced cell reaction?
- I thought 2 is the cathode because it has a larger Eo, and I thought 3 electrons were transfered. this is also wrong

What is the standard cell potential?
1.75 V, this is correct

What is Go for the cell reaction?
I thought Go = -nFEo, so -(2/3)(96485.34)(1.75), but this is wrong. Not sure what I'm doing wrong.

[Borek]

Write balanced reactions for both cases.