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JEE Main Chemistry question

ChemistryThermodynamicsJEE Main

In a fuel cell methanol is used as fuel and oxygen gas is used as oxidiser. The reaction is . At 298 K standard Gibbs energies of formation for , and are , and respectively. If the standard enthalpy of combustion of methanol is , the efficiency of the fuel cell will be

Answer: (D)

Solution

Missing superscript or subscript argumentΔ G^\circ_{rxn}$ = [(-394.4)+2(-237.2)]-[(-166.2)+0] = -868.8+166.2 = -702.6\

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Question ID VK-134842