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The heat of formations of CO((g)) and CO...

The heat of formations of `CO_((g)) and CO_(2(g))` are `-26.4` kcal and `-94.0` kcal respectively. The heat of combustion of carbon monoxide will be _________ .

A

`+26.4` kcal

B

`-67.6` kcal

C

`-120.6` kcal

D

`+52.8 kcal

Text Solution

Verified by Experts

The correct Answer is:
B
Aim: `CO+(1)/(2)O_(2)rarrCO_(2)`
`DeltaH=DeltaH_(f)^(@)(CO_(2))-[DeltaH_(f)^(@)(CO)+(1)/(2)DeltaH_(f)^(@)(O_(2))]`
`=-94.0-(-26.4)=-67.6 kcal`.
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