Given the Following Half-Reactions Occurring in the Silver-Zinc Hearing Aid

question 20

Multiple Choice

Given the following half-reactions occurring in the silver-zinc hearing aid battery, calculate the voltage at 25°C of this battery.
ZnO(s) + H₂O(l) + 2 e- → Zn(s) + 2 OH^-   E° = -1.260 V
Ag₂O(s) + H₂O(l) + 2 e- → 2 Ag(s) + 2 OH^-   E° = +0.342 V

• A) +1.602 V
• B) +1.402 V
• C) +0.858 V
• D) -0.858 V
• E) -1.602 V

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