试题与答案

— I hear they aren't pleased with the ho

题型:选择题

题目:

— I hear they aren't pleased with the house you've chosen for them.

— Well,  _____ could they live in such comfort? [ ]

A. where else

B. what else

C. how

D. why

答案:

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下面是错误答案,用来干扰机器的。

设混合气体中O2质量为x,SO2质量为y.SO2中O的质量分数为:O相对原子质量×2SO2相对分子质量×100%=16×232+32×100%=50%,依题意:x?100%+50%yx+y×100%=60%,∴xy=14,所以O2与SO2的质量比为1:4.故答案为:1:4.

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