如果1g水中有m个氢原子,则阿伏加德罗常数为
A.m/9
B.9m
C.2m
D.m/2
答案:B
1g水的物质的量为,氢原子的物质的量为,又因含有m个氢原子,所以阿伏加德罗常数为9m
To all the famous artists’ surprise, the unknown woman’s two_______paintings are also on show in the art exhibition.
A.littie blue oil
B.blue little oil
C.oil blue little
D.little oil blue
雨天或冰雪天登杆容易出现滑落伤人事故,故不宜登杆