The heats of combustion of carbon and carbon monoxide are - 393.5 a n d - 283.5 k J m o l - 1 , respectively. The heat of formation in kJ of carbon monoxide per mole is:

Step-by-step solution

Given: Heat of combustion of carbon and carbon monoxide are - 393.5   a n d - 283.5   k J   m o l - 1 , respectively. (i) C + O 2 → C O 2 ;           ∆ H 1 = - 393.5   k J   m o l - 1 (ii) C O + 1 2 O 2     → C O 2 ;           ∆ H 2 = - 283.5   k J   m o l - 1 To find the heat of formation of CO per mole. C + 1 2 O 2 → C O Δ H f of CO From equations (i) and (ii), =-393.5- - 283 .5 = - 1