题目

--Would you like to go for a picnic this weekend? Let’s enjoy the fresh air outside. --__________. It will be a sunny day.    A. I’d love to                 B. Don’t mention it    C. No, I won’t                D. It doesn’t matter 答案：A将2 mol X和2 mol Y充入2 L密闭容器中发生如下反应：X(g)＋3Y(g) 2Z(g)＋a Q(g)达到平衡时生成0.8 mol Z，测得Q的浓度为0.4 mol/L，下列叙述错误的是A．a的值为2 B．平衡时X的浓度为0.2 mol/LC．平衡时Y的转化率为60% D．平衡时Z的体积百分含量为20%