已知298K时下列热化学方程式: ①2NH3(g)→N2(g)+3H2(g)3/2 H2(g)+1/2N2(g)=NH3(g)ΔH=23.0553H2(g)+N2(g)=2NH3(g)ΔH=92.222NH3(g)=3H2(g)+N2(g)ΔH=-92.22