The Following Half-Reactions Occur in the Mercury Battery Used in Calculators

question 102

Multiple Choice

The following half-reactions occur in the mercury battery used in calculators. If E°_cell = 1.357 V, calculate the equilibrium constant for the cell reaction at 25°C. (Assume the stoichiometric coefficients in the cell reaction are all equal to 1.) HgO(s) + H₂O(l) + 2e^- Hg(l) + 2OH^-(aq)
ZnO(s) + H₂O(l) + 2e^- Zn(s) + 2OH^-(aq)

• A) 9.4 × 10²²
• B) 7.5 × 10⁴⁵
• C) 6.4 × 10⁶³
• D) 7.8 × 10⁹¹
• E) > 9.9 × 10⁹⁹