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Question

The heat of combustion of liquid ethanol is 327.0 kcal. Calculate the heat of formation of ethanol, given that the heats of formation of CO2(g) and H2O(l) are 94.0 kcal and 68.4 kcal respectively.

A
36.2 kcal
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B
36.2 kcal
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C
66.2 kcal
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D
66.2 kcal
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Solution

The correct option is B 66.2 kcal
Heat of formation of ethanol = 2× heat of formation of CO2 + 3× heat of formation of water - heat of combustion of ethanol
Heat of formation of ethanol = 2(94)+3(68.4)(327) = 66.2kcal

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