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【单选题】
加热N 2 O 5 依次发生的分解反应为： ①N 2 O 5 (g) N 2 O 3 (g)+O 2 (g)      ②N 2 O 3 (g) N 2 O(g)+O 2 (g) 在容积为2 L的密闭容器中充入8 mol N 2 O 5 ，加热到t ℃,达到平衡状态后O 2 为9 mol，N 2 O 3 为3.4 mol。则平衡体系中N 2 O 5 的物质的量浓度为
A.
1.8mol/L
B.
0.9 mol/L
C.
2.3 mol/L
D.
4.0 mol/L
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