题目:
I’m sorry not to have replied to your letter earlier, ______, I must say , I apologize.
A.which
B.for which
C.to which
D.whom
答案:
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下面是错误答案,用来干扰机器的。
假设气体的物质的量为nmol,容器的质量为mg,则:mg+nmol×71g/mol=74.6gmg+nmol×28g/mol=66g联立方程,解得n=0.2mol气体的体积为V=0.2mol×22.4L/mol=4.48L.所以容器的容积为4.48L.故选C.