化学反应N 2 +3H 2 ==2NH 3 的能量变化如下图所示,该反应的热化学方程式是 |
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A.N 2 ( g) +3H 2 (g)=2NH 3 (l) △H = 2(a-b-c) kJ·mol -1 B.N 2 (g)+3H 2 (g)=2NH 3 (g) △H =2(b-a)kJ·mol -1 C.1/2 N 2 (g)+3/2H 2 (g)=NH 3 (l) △H=(b+c-a)kJ·mol -1 D.1/2N 2 (g)+3/2H 2 (g)=NH 3 (g) △H= (a+b)kJ·mol -1 |
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