已知:I.N2H4(l)+O2(g) N2(g)+2H2O(l) △H=-624.0 kJ/mol
II.N2(g)+3H2(g) 2NH3(g) △H=-92.4 kJ/mol
III.2NH3(g) N2H4(l)+H2(g) △H=+144.8 kJ/mol