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. `-110.5`
C. `110.5`
D. `676.5`

Answer

B

Explanation

Given
`C(s)+O_(2)(g)toCO_(2)(g),DeltaH=-393.5kJ"mol"^(-1)`……I
`CO(g)+1/2O_(2)(g)toCO_(2)(g), DeltaH=-283.5kJ"mol"^(-1)`…….ii
`:.` Heat of formation of CO= eqn (i) -eqn (ii)
`=-110kJ`