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

Options

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

Answer

A

Explanation

`C_((s))+ O_2 to CO_(2(g)) DeltaH`= -393.5 ….(1)
`CO_((g)) + 1/2O_(2(g)) to CO_(2(g)) DeltaH`= - 283.5 …(2)
Heat of formation of `CO_((g))`
`rArr` (1)-(2)
`C_((s)) + 1/2O_(2(g)) to CO_(2(g)) DeltaH`=-110.0 kJ