题目

某温度下，反应SO2(g)+ 1/2O2(g) SO3 (g) 的平衡常数K1=50，在同一温度下，反应2SO3(g) 2SO2(g) + O2(g)的平衡常数K2的值为(    ) A. 2500           B. 100           C. 4×10－4         D. 2×10－2 答案：C(   ) 13.—_________ ？  ―It's Saturday.A. What's the date?         B. What time is it?  C. What day is it today?    D. What's day?