The heats of combustion of carbon and carbon monoxide are `-393.5and-283.5kJmol^(-1)` respectively. The heat of formation (in kJ) of carbon monoxide per mole is:

Options

A. 676.5
B. `-676.5`
C. `-110.5`
D. 110.5

Answer

C

Explanation

`C(s)+O_(2)(g)rarrCO_(2)(g), DeltaH=-393.5 kJ//mol`
`CO(g)+(1)/(2)O_(2)(g)rarrCO_(2)(g) , DeltaH=-283.5 kJ//mol`
`C(s)+(1)/(2)O_(2)(g)rarrCO(g) , DeltaH=-393.5+283.5 kJ//mol=-110 kJ//mol`