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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
`CH_(3)OH(l)+3/2O_(2)(g)toCO_(2)(g)+2H_(2)O(l)`
At 298 K standard Gibb’s 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 -

A

0.87

B

0.9

C

0.97

D

0.8

Text Solution

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The correct Answer is:
C
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MOTION-THERMODYNAMICS-EXERCISE - 4 (LEVEL - I)
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  2. The work of 146 kJ is performed in order to compress one kilo mole of ...

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  5. A Carnot engine, having an efficiency of eta=1//10 as heat engine, is ...

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  8. Identify the correct statement regarding a spontaneous process -

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  9. Standard entropy of X(2),Y(2)andXY(3) are 60, 40 and 50 JK^(-1)mol^(-1...

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

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  11. A diatomic ideal gas is used in a Carnot engine as the working substan...

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  12. For a particular reversible reaction at temperature T, DeltaHandDeltaS...

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  13. The entropy change involved in the isothermal reversible expansion of ...

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  14. In view of the signs of Delta(r)G^(@) for the following reactions : ...

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  15. The incorrect expression among the following is -

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  16. A piston filled with 0.04 mol of an ideal gas expands reversibly from ...

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  17. The following reaction is performed at 298 K ? 2NO(g)+O(2)(g)hArr2NO...

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  18. The heats of combustion of carbon and carbon monoxide are -393.5and-28...

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  19. DeltaU is equal to:

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  20. Given C(("graphite"))+O(2)(g)toCO(2)(g), Delta(r)H^(@)=-393.5kJmol...

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