题目:
在恒温恒压的条件下,一密闭容器内发生反应:2NO2(g) N2O4(g),达平衡时,再向容器内通入一定量的NO2(g),重达平衡后,与第一次平衡时相比,NO2的体积分数( )
A.不变
B.增大
C.减小
D.无法判断
答案:
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