The enthalpies of combustion of carbon and carbon monoxide are `-390 kJ mol^(-1)` and `-278 kJ mol^(-1)` respectively. The enthalpy of formation of carbon monoxide is

Options

A. `668 kJ mol^(-1)`
B. `112 kJ mol^(-1)`
C. `-112 kJ mol^(-1)`
D. `-668 kJ mol^(-1)`

Answer

C

Explanation

`DeltaH=H_(P)-H_(R)`