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  4. The number of Faradays required to produce one mole of water from a hydrogen-oxygen fuel cell containing aqueous alkali as electrolyte is

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Q. The number of Faradays required to produce one mole of water from a hydrogen-oxygen fuel cell containing aqueous alkali as electrolyte is

Electrochemistry

Solution:

For $H _{2}- O _{2}$ Fuel cell
$2 H _{2}+4 OH ^{-} \rightarrow 4 H _{2} O _{+} 4 e ^{-} $
$\frac{ O _{2}+2 H _{2} O +4 e ^{-} \rightarrow 4 OH ^{-}}{2 H _{2}+ O _{2} \rightarrow 2 H _{2} O (2 mole )}$
required no. of faraday for two mole $H _{2} O =4$
required no. of faraday for one mole $H _{2} O =2$