At 360 K, the galvanic reaction MnO_4^- (aq)+8 ,H^+(aq)+5 ,Fe^ 2+ (aq) Mn^ 2+ (aq)+4…

CHEMISTRY · Subjective · A Level · Chemistry · Electrode potentials · Electrode potentials

Problem

At 360 K, the galvanic reaction

\mathrm{MnO_4^- (aq)+8\,H^+(aq)+5\,Fe^{2+}(aq)\rightarrow Mn^{2+}(aq)+4\,H_2O(l)+5\,Fe^{3+}(aq)}

has a standard cell potential of

E^\circ = 0.74\,\text{V}

. The reaction involves

n=5

electrons. The mixture contains

[\mathrm{MnO_4^-}]=5.0\,\text{mM}

[\mathrm{Mn^{2+}}]=0.20\,\text{M}

[\mathrm{Fe^{2+}}]=0.10\,\text{M}

[\mathrm{Fe^{3+}}]=0.50\,\text{M}

, and

[\mathrm{H^+}]=0.010\,\text{M}

. Calculate the cell potential,

E

, at 360 K. (Constants:

R=8.314\,\text{J\,mol}^{-1}\text{K}^{-1}

F=9.65\times10^{4}\,\text{C\,mol}^{-1}