N2(g)+为02(g)→9g)△H=+90.25kJ NOg+9402(g)+NO(g) 4H=-5707 kJ N4g)+O24g)→NO2(g)△H=+3318kJ No(g)+O2(g) △H°=-57.07kJ △H°=+90.25kJ NO,(g) △H°=+33.18kJ N2(g)+O2(g)½N2(g) + O (g) + O2(g) → NO2(g) ∆H = +33.18 kJ = +33.18 kJ ½N2(g) + ½O2(g) → NO(g) ∆H = +90.25 kJ = +90.25 kJ NO(g) + NO(g) + ½O2(g) → NO2(g) ∆H = −57.07 kJ 57.07 kJ