A Voltaic Cell Is Based Upon the Half-Reactions Below Calculate the Equilibrium Constant for the Overall Chemical Reaction at q)+2

question 17

Multiple Choice

A voltaic cell is based upon the half-reactions below. $\begin{array}{lccc}\mathrm{Pb}^{2+}(a q) +2 e^{-} \rightarrow \mathrm{Pb}(s) & E^{\circ}=-0.127 \mathrm{~V}\\\mathrm{Cd}^{2+}(a q) +2 e^{-} \rightarrow \mathrm{Cd}(s) & E^{\circ}=-0.402 \mathrm{~V} \\\end{array}$

Calculate the equilibrium constant for the overall chemical reaction at 25°C.(R = 8.31 J/K?mol,F = 96480 C/mol e?)

• A) 1.3 × 10²
• B) 4.4 × 10⁴
• C) 2.0 × 10⁹
• D) 3.9 × 10¹⁸
• E) 1.3 × 10²¹

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