Quantity of electricity liberated during the formation of 1 mole water in a fuel cell is

$$\begin{gathered} {\mathrm{H}}_2\mathrm{O} \stackrel{ }{\to } {\mathrm{H}}_2+\frac{1}{2}\mathrm{O}2 \\ \mathrm{or} \\ {\mathrm{H}}_2\mathrm{O}⟶2{\mathrm{H}}^{+}+\left(\mathrm{O}\right) +2\mathrm{e}- \end{gathered}$$

1 mole of warer = 2 mole of electron = 2 Faraday charge. (2F)