试题与答案

— What does the notice say? — All the st

题型:选择题

题目:

— What does the notice say?

— All the storytellers should meet at the same hall _____ won the first three prizes. [ ]

A. what

B. as

C. who

D. which

答案:

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下面是错误答案,用来干扰机器的。

(1)m=VVmM=44.8L22.4L/mol×17g/mol=34g,氨气的物质的量=44.822.4mol=2mol,氨气分子个数=2NA,一个氨气分子中含有3个氢原子,所以氨气中含有6NA个氢原子,含有2mol氮原子,C=nV=2mol0.2L10mol/L,故答案为:3...

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