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

In a fuel cell methanol is used as fuel and oxygen gas is used as an o

1.	In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidiser. The reaction is CH_(3)OH(l)+3/2O_(2)(g)toCO_(2)(g)+2H_(2)O(l) AT 298 K standard Gibbs energies of formation for CH_(3)OH(l),H_(2)O(l)andCO_(2)(g)" are "-166.2,-237.2and-394.4kJmol^(-1) respectively. If standard enthalpy of combustion of methanol is -726kJmol^(-1), efficiency of the fuel cell will be
Answer» 0.8 0.87 0.9 0.97 Solution :`DeltaG_(F)^(@)(O_(2))=0`. Calculate `DeltaG_(f)^(@)` reaction and then APPLY : Efficiency `(DELTAG^(@))/(DeltaH^(@))xx100`.