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【单选题】
下列说法中可以说明N 2 +3H 2 2NH 3 已达平衡的是 [ ]A.
在一个N≡N键断裂的同时，有3个H-H键断裂
B.
在一个N≡N键断裂的同时，有2个N-H键断裂
C.
在一个N≡N键断裂的同时，有6个N-H键断裂
D.
在一个N≡N键断裂的同时，有6个N-H键形成
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