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. ` 1 1 0 K J`
B. ` 6 7 6 . 5 K J`
C. `- 6 7 6 . 5 K J`
D. `1 1 0.5 K J`

Answer

A

Explanation

`{:(C + O_(2) to CO_(2) ,, Delta H = -393.5 kJ),(CO + 1/2 O_(2) to CO_(2),, Delta H = -283.5kJ),(-" "-, - " "+):}/(C + 1/2 O_(2) to CO,, Delta H = -110 kJ)`