Home
Class 12
CHEMISTRY
In a fuel cell methanol is used as fuel ...

In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is `:`
`CH_(3)OH_((l))+(3)/(2)O_(2(g))rarr CO_2((g))+2H_(2)O_((l))`
At `298K` standard Gibb's energies of formation for `CH_(3)OH(l), H_(2)O(l)` and `CO_(2)(g)` are `-166.2,-237.2` and `-394.4kJ mol^(-1)` respectively. If standard enthalpy of combustion of methanol is `-726kJ mol^(-1)`, efficiency of the fuel cell will be `:`

A

0.87

B

0.9

C

0.97

D

0.8

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • THERMOCHEMISTRY

    MOTION|Exercise Exercise - 4 Level-II|8 Videos

  • THERMOCHEMISTRY

    MOTION|Exercise Exercise - 3|50 Videos

  • SURFACE CHEMISTRY

    MOTION|Exercise Exercise - 3 (Level-II)|12 Videos

  • THERMODYNAMICS

    MOTION|Exercise EXERCISE - 4 (LEVEL - II)|19 Videos

Similar Questions

Explore conceptually related problems

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

In a fuel cell, methanol if used as fuel and oxygen gas is used as an oxidiser. The reaction is CH_(3)OH(l) +(3)/(2)O_(2)(g)rarrCO_(2)(g)+2H_(2)O(l) Calculated standard Gibbs free enegry change for the reaction that can be converted into electircal work. If standard enthalpy of combustion for methanol is -702 kJ mol^(-1) , calculate the efficiency of converstion of Gibbs energy into useful work. Delta_(f)G^(Theta) for CO_(2),H_(2)O, CH_(3)OH,O_(2) is -394.00, -237.00,-166.00 and 0 kJ mol^(-1) respectively.

The heat of formations for CO_(2)(g),H_(2)O(l) and CH_(4)(g) are -400 kJ mol^(-1),-280" kJ "mol^(-1) and -70" kJ "mol^(-1) , respectively. The heat of combustion of CH_(4) in kJ mol^(-1) is

In a fuel celll, methanol is used as a fuel and O_(2) is used as oxidizer. The standard enthalpy of combustion of methanol is -726 kJ mol^(-1) . The standard free energies of formation of CH_(3)OH(I), CO_(2)(g) and H_(2)O(I) are -166.3, -394.4 and -237.1 kJ mol^(-1) respectively. The standard free energy change of the reaction will be