一定温度下,体积一定的密闭容器中进行如下可逆反应:X(g)+Y(

一定温度下,体积一定的密闭容器中进行如下可逆反应:X(g)+Y(g)Z(g)+W(s)  △H>0,下列叙述正确的是(     )

A.加入少量的W,逆反应速率增大

B.当容器中气体压强不变时,反应达到平衡

C.升高温度,平衡逆向移动

D.平衡后加入X,上述反应的△H增大

答案

B


解析:

A项中W为固体,速率不变。B项中反应前后气体系数不等,当压强不变时,说明各气体的物质的量不变,则反应达到平衡状态。C项中升高温度,由于反应正向吸热,平衡向正向移动。△H是指发生每摩反应的一个固定值,它不会因加入物质的量的多少而改变。

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