Chemistry - Electrochemistry Question with Solution | TestHub

In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is ${\mathrm{CH}}_3\mathrm{OH}(\ell )+\frac{3}{2}{\mathrm{O}}_2(\mathrm{g})\to {\mathrm{CO}}_2(\mathrm{g})+2{\mathrm{H}}_2\mathrm{O}(\ell )$ At $298\mathrm{K}$ standard Gibb's energies of formation for ${\mathrm{CH}}_3\mathrm{OH}(\ell ),{\mathrm{H}}_2\mathrm{O}(\ell )$ and ${\mathrm{CO}}_2(\mathrm{g})$ are $-166.2,-237.2$ and $-394.4\mathrm{kJ}{\mathrm{mol}}^{-1}$ respectively. If standard enthalpy of combustion of methanol is $-726\mathrm{kJ}{\mathrm{mol}}^{-1}$, efficiency of the fuel cell will be