(2012?徐汇区二模)化学反应N2+3H2→2NH3的能量变化如图所示,该反应的热化学方程式是( )A.N2(g)+H2(g)→NH3(1)-46 kJB.N2(g)+H2(g)→NH3(g)-454 kJC.N2(g)+3 H2(g)→2 NH3(g)+92 kJD.N2(g)+3 H2(g)→2 NH3(1)+431.3 kJ