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Question

The heat of formation of CO and CO2 are 26.4 kcal and 94 kcal respectively. The heat of combustion of carbon monoxide will be:

A
+26.4 kcal
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B
67.6 kcal
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C
120.4 kcal
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D
+52.8 kcal
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Solution

The correct option is B 67.6 kcal
We need to calculate heat of combustion of CO,
CO+12O2CO2
So, ΔH = ΔHof (CO2)[ΔHof(CO)+12ΔHof(O2)
For elements in pure state ΔHof(O2) = 0
ΔH = 94(26.4) kcal = 67.6 kcal

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