1.

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

Answer»

`+26.4` kcal
`-67.6` kcal
`-120.6` kcal
`+52.8 kcal

Solution :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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