氨气的燃烧热的热化学方程式
NH3(g)燃烧生成NO2和H2O,已知
(1)H2(g)+1/2O2(g)==H2O △H=-241.8kJ/mol
(2)N2(g)+2O2(g)==2NO2(g) △H=+33.9kJ/mol
(3)1/2N2(g)+3/2H2(g)==NH3(g) △H=-46.0kJ/mol
(4)H2O(l)==H2O(g) △H=+44kJ/mol
则NH3(g)的燃烧热的热化学方程式：________________

求△H计算方法