一定条件下，向一带活塞的密闭容器中充入2mol SO2和1mol O2，发生下列

一定条件下，向一带活塞的密闭容器中充入2mol SO₂和1mol O₂，发生下列反应：达到平衡后改变下述条件，SO₃气体平衡浓度不改变的是

A. 保持温度和容器体积不变，充入1mol SO₃(g)

B. 保持温度和容器内压强不变，充入1mol SO₃(g)

C. 保持温度和容器内压强不变，充入1mol O₂(g)

D. 保持温度和容器内压强不变，充入1mol Ar (g)

答案

Ｂ

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一定条件下，向一带活塞的密闭容器中充入2mol SO2和1mol O2，发生下列

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