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In a fuel cell methanol is used as fuel ...

In a fuel cell methanol is used as fuel and oxygen is used as an oxidiser. The reaction is :
`CH_(3)OH(l)+(3)/(2)O_(2)(g)rarr CO_(2)(g)+2H_(2)O(l)`
At 298 K, 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 `-394.4` kJ/mol respectively. If standard enthalpy of combustion of methanol is - 726 kJ/mol, effeciency of the fuel cell will be :

A

`80%`

B

`87%`

C

`90%`

D

`97%`

Text Solution

Verified by Experts

The correct Answer is:
D
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