题目内容
有下列物质:①10.0gNH3;②标准状况下11.2LHF;③4℃时10ml水;④标准状况下22.4LCH4所含质子数由多到少的是( )
A.④③①② | B.④①③② | C.②④①③ | D.④②①③ |
①10.0gNH3中n(NH3)=
=
mol,质子数为
mol×10×NA/mol=
NA;
②标准状况下11.2LHF,n(HF)=
=0.5mol,质子数为0.5mol×10×NA/mol=5NA;
③4℃时10ml水,n(H2O)=
=
mol,质子数为
mol×10×NA/mol=
NA;
④标准状况下22.4LCH4,n(CH4)=
=1mol,质子数为1mol×10×NA/mol=10NA,
则所含质子数由多到少的是④①③②,
故选B.
10g |
17g/mol |
10 |
17 |
10 |
17 |
100 |
17 |
②标准状况下11.2LHF,n(HF)=
11.2L |
22.4L/mol |
③4℃时10ml水,n(H2O)=
10g |
18g/mol |
10 |
18 |
10 |
18 |
100 |
18 |
④标准状况下22.4LCH4,n(CH4)=
22.4L |
22.4L/mol |
则所含质子数由多到少的是④①③②,
故选B.
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