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【单选题】
在一密闭容器中充入一定量的N 2 和O 2 ，在电火花作用下发生反应N 2 +O 2 ═2N0，经测定前3s用N 2 表示的反应速率为0.1mol/（L?s），则6S末N0的浓度为（ ）A.
1.2 mol?L -1
B.
大于1.2 mol?L -1
C.
小于1.2 mol?L -1
D.
不能确定
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