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+12O2→CO2
So, ΔH = ΔHof(CO2)−[ΔHof(CO)+12ΔHof(O2)
For elements in pure state ΔHof(O2) = 0 ΔH = −94−(−26.4) kcal = −67.6 kcal