Methanol is used as a fuel in a fuel cell used for producing electricity from the following reaction ${\mathrm{CH}}_3\mathrm{OH}\left(\mathrm{l}\right)+\frac{3}{2}{\mathrm{O}}_2( \mathrm{g})\to {\mathrm{CO}}_2( \mathrm{g})+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$  calculate the efficiency of conversion of gibbs energy into useful work. From the following data (in percentage) ${\mathrm{\Delta }}_{\mathrm{f}}{\mathrm{G}}^0-{\mathrm{CO}}_2=-394.36 \mathrm{kJ}/\mathrm{mol};{\mathrm{H}}_2\mathrm{O}=-237.13 \mathrm{kJ}/\mathrm{mol}$  ${\mathrm{CH}}_3\mathrm{OH}=-166.27 \mathrm{kJ}/\mathrm{mol};{\mathrm{O}}_2=0 \mathrm{kJ}/\mathrm{mol}$ Standard enthalpy of combustion of ${\mathrm{CH}}_3\mathrm{OH}$ is -726 kJ/mol