First slide

Standard EMF of a cell

Question

Consider the half-cell reduction reaction
${Mn}^{2 +} + 2 e^{-} \to Mn, E ° = - 1.18 V {Mn}^{2 +} \to {Mn}^{3 +} + e^{-}, E ° = - 1.51 V The E ° for the reaction 3 {Mn}^{2 +} \to {Mn}^{0} + 2 {Mn}^{3 +}, and possibility of the forward reaction are respectively$

Moderate

Solution

${Mn}^{2 +} + 2 e^{-} \to Mn E ° = - 1.18 V 2 {Mn}^{2 +} \to 2 {Mn}^{3 +} + 2 e^{-} E ° = - 1.51 V For the cell, 3 {Mn}^{2 +} \to Mn + 2 {Mn}^{3 +} E ° = - 2.69 V Since the E ° value is negative, so the process is non - spantaneous$

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