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Question

The heats of combustion of CH4(g) and C2H6(g) are −890.3 and −1560 Jmol−1 respectively. Which has higher calorific value?

A
Methane
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B
Ethane
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C
Can't say
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D
Both have same calorific value
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Solution

The correct option is A Ethane
Calorific value is the amount of heat produced by complete combustion of 1 Kg of fuel,
so, in case of methane, 16g of methane produce 890.3Jmol1 amount of energy,
so, 1 Kg of metahne produce 55643.75Jmol1
in case of ethane, 28 g produce 1560Jmol1 amount of energy
so, 1 Kg of ethane produce enrgy = 55714.28Jmol1
hence, the energy produce by 1 Kg of ethane is mor than that of methane,
so, Ethane have higher calorific value.

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