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 standard entropy change accopanying the cell reaction willbe

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 standard entropy change accopanying the cell reaction willbe
Answer» `+ 24.11 JK^(-1)` `-24.1JK^(-1)MOL^(-1)` `+19.1JK^(-1) mol^(-10` `-19.1 JK^(-1) mol^(-1)` Solution :`DELTAG^(@) = DeltaH^(@) -T DeltaS^(@)` or `DeltaS^(@) = (DeltaH^(@) - DeltaG^(@))/( T)` ,brgt `= (- 726.0 - ( - 720.3) KJ mol^(-1))/(298K)` ` = - ( 5.7 kJ mol^(-1))/( 298K) = - ( 5700Jmol^(-1))/(298K)` `=- 19.1 JK^(-1) mol^(-1)`