CO(g)
C(s)
CO2(g)
△H1 = △H2 + △H3
∴△H3 = △H1 - △H2 = -393.5 kJ/mol -(-283.0 kJ/mol) = -110.5 kJ/mol
① C(g) + O2 (g) = CO2 (g) △H1 =- 393.5kJ /mol
② CO(g) + 1/2O2 (g) = CO2 (g) △H2 =- 283.0 kJ /mol
C(s) + ½ O2(g) = CO(g) △H3=?