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【单选题】
在容积不变的某2 L密闭容器中，充入5 mol H 2 和N 2 的混合气体，在一定条件下，5 min后反应达到平衡，此时容器内压强是反应前的4/5.则下列说法不正确的是 [ ]A.
从反应开始到平衡时，用H 2 表示平均反应速率为0.15 mol/(L·min)
B.
反应达到平衡时，NH 3 的物质的量浓度是0.5 mol/L
C.
反应达到平衡时，N 2 和H 2 的物质的量之比一定为1∶3
D.
反应达到平衡时，反应物和生成物的总的物质的量之比为3∶1
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A.
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B.
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C.
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D.
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E.
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