一定温度下,在恒容密闭容器中进行:2SO2(g)+O2(g)2SO3(g),若

一定温度下,在恒容密闭容器中进行:2SO2g+O2g2SO3g),若开始时充入2molSO22molO2,反应达到平衡后,SO2的体积分数为a%。若按下列四种配比作为起始物质,平衡后A的体积分数大于a%的是              

A2molSO3                                                             B2molSO22molO21molHe(不反应)

C2molSO31molO2                D4molSO24molO2

答案

A

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