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18/01/2022 5:18 pm
Topic starter
In the button cells widely used in watches and other devices the following reaction takes place:
Zn(s) + Ag2O(s) + H2O(l) → Zn2+(aq) + 2Ag(s) + 2OH- (aq). Determine ΔrG⊖ and E⊖ for the reaction.
1 Answer
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18/01/2022 5:26 pm
Zn(s) → Zn2+(aq) + 2e- ; E⊖ = 0.76 V
Ag2O(s) + H2O(l) + 2e- → 2Ag(s) + 2OH- (aq); E⊖ = 0.344 V
Zn(s) + Ag2O(s) + H2O(l) → Zn2+(aq) + 2Ag(s) + 2OH- (aq) ; E⊖ = 1.104 V
∴ E⊖ = 1.104 V
We know that,
ΔrG⊖ = nFE⊖
= - 2 × 96487 × 1.04
= - 213043.296 J
= - 213.04 kJ