In a fuel cell, methanol is used as fuel oxygen gas is used as an oxidizer. The reaction is CH_(3)OH(l)+(3)/(2)O_(2)(g)toCO_(2)(g)+2H_(2)O(l) At 298K, standard Gibbs energies of formation for CH_(3)OH(l),H_(2)O(l) and CO_(2)(g) are -166.2, -237.2 and -394.4 kJ mol^(-1) respectively. If standard enthalpy of combusion of methanol is -726 kJ mol^(-1), efficiency of the fuel cel will be

In a fuel cell, methanol is used as fuel oxygen gas is used as an oxid

1.	In a fuel cell, methanol is used as fuel oxygen gas is used as an oxidizer. The reaction is CH_(3)OH(l)+(3)/(2)O_(2)(g)toCO_(2)(g)+2H_(2)O(l) At 298K, standard Gibbs energies of formation for CH_(3)OH(l),H_(2)O(l) and CO_(2)(g) are -166.2, -237.2 and -394.4 kJ mol^(-1) respectively. If standard enthalpy of combusion of methanol is -726 kJ mol^(-1), efficiency of the fuel cel will be
Answer» 0.8 0.87 0.9 0.97 Solution :`Delta_(R)G=-394.4+2(-237.2)-(-166.2)` `=-702.6" kJ "mol^(-1)` EFFICIENCY`=(Delta_(r)G)/(DELTAH)=(-702.6)/(-726)xx100=97%`