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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 :
` C H _(3) O H (I) + 3/2 O_(2) (g) + 2 H _(2) O (I)` . At 298 K standard Gibbs energies of formation ` C H _(3) O H (I) , H_(2) O_(1) , and C O _(2) (g) ` are `-1 6 6 . 2, -2 3 7 . 2, and - 3 9 4 . 4 K J m o l ^(-1)`, respectively. If standard enthalpy of combustion of methanol is `-7 2 6 K J m o l^(-1)` ,efficiency of the fuel cell will be

A

0.8

B

0.87

C

0.9

D

0.97

Text Solution

Verified by Experts

Efficiency of fuel cell `(eta)=(DeltaG^(@))/(DeltaH^(@))=(-702.6)/(1-726)xx100 cong97%`
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