在一密闭容器中充入1molNO2气体,建立如下平衡:2NO2

在一密闭容器中充入 1mol NO₂气体,建立如下平衡:2NO₂N₂O₄,测得NO₂转化率为a%，在温度、体积不变时,再通入1mol NO₂,待重新建立平衡时,测得NO₂转化率为b%,a与b比较（）

A．a＞b

B．a＜b

C．a="b" 　

D．无法确定

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