题目内容
①NH4C1;②NH4N03;③CO(NH2)2三种氮肥按N元素质量分数由高到低的顺序排列正确的是( )
A.①②③ | B.③②① | C.③①② | D.②③① |
NH4C1中N元素质量分数=
=26%.
NH4N03中N元素质量分数=
=35%.
CO(NH2)2中N元素质量分数=
=46.7%.故选B.
14 |
14+35.5+4 |
NH4N03中N元素质量分数=
28 |
28+48+4 |
CO(NH2)2中N元素质量分数=
28 |
28+4+12+16 |
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