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【单选题】
对于恒容密闭容器中发生的可逆反应N 2 (g)+3H 2 (g)≒2NH 3 (g) ΔH<0,能说明反应达到化学平衡状态的为( )
A.
断开一个N≡N键的同时有6个N-H键生成
B.
混合气体的密度不变
C.
混合气体的平均相对分子质量不变
D.
N 2 、H 2 、NH 3 分子数比为1∶3∶2的状态
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