In a fuel cell (device used for producing electricity directly from a chemical reaction )methanol is used as a fuel and oxygen gas is used asan oxidizer. The standard enthalpyof combustion of methanol is -721kJ mol^(-1) . The standard free energiesof formation of CH_(3)OH(l, CO_(2)(g) andH_(2)O(l) are- 166.3 , -394.4 and - 237 .1 kJ mol^(-1) respectively. The efficiencyof the fuel cell will be

In a fuel cell (device used for producing electricity directly from a

1.	In a fuel cell (device used for producing electricity directly from a chemical reaction )methanol is used as a fuel and oxygen gas is used asan oxidizer. The standard enthalpyof combustion of methanol is -721kJ mol^(-1) . The standard free energiesof formation of CH_(3)OH(l, CO_(2)(g) andH_(2)O(l) are- 166.3 , -394.4 and - 237 .1 kJ mol^(-1) respectively. The efficiencyof the fuel cell will be
Answer» `96.7 %` `66.2%` `41.3%` `85.1%` SOLUTION :EFFICIENCY `=(DELTAG)/(DELTAH) = ( - 702.3)/( - 726) = 0.967= 96.7%`