Question

A cell is constructed of the following two half cells.

Ag+ + e⇌ Ag + 0.80 V Al3+ 3e ⇌ Al - 1.67V
What is E+ of the cell?
A: 2.47 V
B: 0.087 V
C: -0.87 V
D: 5.81 V

Please explain
Thanks

Answer 1

I believe the correct answer from the choices listed above is option A. The E+ of the cell would be 2.47 V. E of the cell is given by the formula E(cathode) - E(anode) . So in this case the first half cell reaction is the reaction that takes place in the cathode and the second one takes place in the anode.