(1)*3-(2):2Fe3O4 + 8CO === 6Fe + 8CO2
(1)*3-(2)-(3)*2:6FeO + 6CO === 6Fe + 6CO2
FeO(s) + CO(g) === Fe(s) + CO2(g)的焓变为:[(-27.6)*3-(-50.75)-(-36.5)*2]/6=+6.825
(1)*3-(2):2Fe3O4 + 8CO === 6Fe + 8CO2
(1)*3-(2)-(3)*2:6FeO + 6CO === 6Fe + 6CO2
FeO(s) + CO(g) === Fe(s) + CO2(g)的焓变为:[(-27.6)*3-(-50.75)-(-36.5)*2]/6=+6.825