Calculate the heat of formation of carbon monoxide from the following data.
. (i) `C(s) + O_(2)(g) to CO_(2) (g)` , `Delta H =- 393.5 kJ`
(ii) `CO(g) + (1)/(2) O_(2)(g) to CO_(2)(g)` , `Delta H = - 282.8 kJ`

Explanation

We are to calculate the heat of formation of carbon monoxide.
`C(s) = (1)/(2) O_(2) to CO (g) , Delta H= ?`
It can be calculated by subtracting equation (ii) from equation (i).
`C(s) + O_(2) to CO_(2) (g), Delta H = - 393.5 kj`
`CO(g) + (1)/(2) O_(2)(g) to CO_(2) (g) , Delta H = - 282.8 kj`
`C(s) + (1)/(2) O_(2) (g) to CO(g) , Delta H= - 110.7 Kj`