help to confirm my answer?

Question

What is the E°cell for the cell represented by the combination of the following half-reactions?
ClO4-(aq) + 8H+(aq) + 8e- ↔ Cl-(aq) + 4H2O(l) E° = 1.389 V
VO2+(aq) + 2H+(aq) + e- ↔ VO+(aq) + H2O(l) E° = 0.991 V
-0.398 V
-2.380 V
0.398 V
2.380 V
none of the above

is it 2.380v correct.


The value of E°cell for the reaction
2Cr3+(aq) + 6Hg(l) → 2Cr(s) + 3Hg22+(aq)
is 1.59 V. Calculate ΔG° for the reaction.
-921 kJ
-767 kJ
-460 kJ
-307 kJ
none of the above

is -921Kj correct
plz confirm my answer

Answer 1

1. If you're looking for the spontaneous reaction, then the answer is 0.398 V. Both are written as reductions; in order to get a reaction, one of them has to be reversed to be an oxidation and the sign of Eo will change. So reverse the second reaction, which makes Eo for that reaction -0.991 V and add the two together.

2. delta G = -nFEo = - (6)(96500)(1.59) = -920610 J = -921 kJ