a
\(Fe →  Fe^{2+} 2e^{-}\) માટે, \(\Delta G_1^{0} = -;nFE^{0}_{cell1} = -(2 × 96500 × 0.44)\)

\(2{H^ + } + 2{e^ - } + \frac{1}{2}{O_2} \to {H_2}{O_{(l)}}\,\) માટે 

\(\Delta {{\text{G}}_{\text{2}}}^{\text{0}}{\text{  =   - nF}}{{\text{E}}^{\text{0}}}{{\text{ }}_{{\text{cell2}}}}{\text{  =  ( - 2  }} \times {\text{ 96500 }} \times {\text{  1}}{\text{.23)}}\)

\(Fe + 2{H^ + } + \frac{1}{2}{O_2} \to F{e^{2 + }} + {H_2}O\) માટે \(\Delta {{\text{G}}_{\text{3}}}^{\text{0}}{\text{  =   }}\Delta {{\text{G}}_{\text{1}}}^{\text{0}}{\text{  +   }}\Delta {{\text{G}}_{\text{2}}}^{\text{0}}\)

\(\Delta G_3^{0} = (-2 × 96500 × 0.44) + (-2 × 96500 ×1.23)  = -322310\) જૂલ  \(= -322.310 \) કિલોજૂલ  \(= -322\) કિલોજૂલ/મોલ