Question
Chemistry Question on Electrochemistry
A button cell used in watches functions as following
Zn(s) + Ag2O(s) + H2O(l) ⇌ 2Ag(s) + Zn2+ (aq) + 20H- (aq)
If half cell potentials are
Zn2+(aq) + 2e- → Zn(s); E° = -0.76 V
Ag2O(s) + H2O(l) + 2e- → 2Ag(s) + 20H-(aq),
E° = 0.34 V
The cell potential will be
A
1.10 V
B
0.42 V
C
0.84 V
D
1.34 V
Answer
1.10 V
Explanation
Solution
The correct option is (A): 1.10 V.