已知实验室以乙醇为原料来制备乙酸乙酯时,经历了下面三步反应: ①C2H5OHCH3CHO ②CH3CHOCH3COOH ③CH3COOH+C2H5OHCH3COOC2H5+H2O 已知①②③三步反应的转化率分别为a、b、c,则由乙醇制乙酸乙酯时总的转化率为( )。 A. B.abc C. D.2abc
Many people say that they are working too many hours. They don’t have enough time to relax or stay with their family. Work hours are different from one country to another. In France, people spen