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

question 17

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 × 10 ²²
• B)7.5 × 10 ⁴⁵
• C)6.4 × 10 ⁶³
• D)7.8 × 10 ⁹¹
• E)> 9.9 × 10 ⁹⁹

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