Zinc/silver oxide button batteries are used in calculators and watches. Although the silver component makes them expensive, this is outweighed by their high performance. The battery uses KOH as the electrolyte, and the overall cell reaction is:
Ag2O + H2O -1- Zn —- 2Ag + Zn(OH)2
(a) What are the two half-reactions that make up the cell?
(b) If Ag20 acts as the cathode, and E°values for the two half-cells are -1.25 and + 0.34 V, assign each reduction potential to the correct half-cell in part (a).
(c) What is E°cell? Calculate ΔG°(298 K) for the cell reaction written above.
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