18.0g |
20g/mol |
18.0g |
20g/mol |
B、室温下,42.0 g乙烯和丙烯的混合气体中含有的碳原子数,乙烯和丙烯最简式相同,只需要计算42.0gCH2中的碳原子数=
42.0g |
14g/mol |
C、标准状况甲苯不是气体,22.4 L甲苯不是1mol,故C错误;
D、标准状况下,a L甲烷和乙烷混合气体物质的量
aL |
22.4L/mol |
a |
22.4 |
故选:BD.
a |
22.4 |
18.0g |
20g/mol |
18.0g |
20g/mol |
42.0g |
14g/mol |
aL |
22.4L/mol |
a |
22.4 |