已知:
Ⅰ.2H2(g)+O2(g)=2H2O(g)DH1=-483.6kJ·mol-1
Ⅱ.N2(g)+O2(g) 2NO(g)DH2=+180.5kJ·mol-1
Ⅲ.2H2(g)+2NO(g) N2(g)+2H2O(g)