Chemistry - Electrochemistry Question with Solution | TestHub

${\text{Fe}}^{\text{3+}}\text{+}{\text{e}}^{-}\to {\text{Fe}}^{\text{2+}}\text{;}{\text{ΔG}}_{\text{1}}^{\text{o}}\text{=}-\text{1}\text{×}\text{F}\text{×}\text{0}\text{.77}$
${\text{Fe}}^{\text{2+}}\text{+}\text{2}{\text{e}}^{-}\to \text{Fe;}{\text{ΔG}}_{\text{2}}^{\text{o}}\text{=}\text{2}\text{×}\text{F}\text{×}\text{0}\text{.44}$
${\text{Fe}}^{\text{3+}}\text{+}3{\text{e}}^{-}\to \text{Fe;}{\text{ΔG}}_{\text{3}}^{\text{o}}=-3\times \text{F}\times {\text{E}}^{\text{o}}$
$\text{=0}\text{.11}\text{V}$
$\therefore {\text{E}}^{\text{o}}=\frac{-0.11}{3}=-0.036\text{V}$