ΔH (formation) (CO2)=−394\Delta H \text{ (formation) } (\mathrm{CO}_2) = -394ΔH (formation) (CO2)=−394
ΔH (formation) (H2O)=−242\Delta H \text{ (formation) } (\mathrm{H}_2\mathrm{O}) = -242ΔH (formation) (H2O)=−242
ΔH (formation) (CO)=−110\Delta H \text{ (formation) } (\mathrm{CO}) = -110ΔH (formation) (CO)=−110
X=∑HPF−∑HRFX = \sum H_{P}^{F} - \sum H_{R}^{F}X=∑HPF−∑HRF
= (-394+ 0) - (-110 - 242 )
= -394 +352
= - 42 kJmol−1^{-1}−1
