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ask for some question~~~~~
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i am form 5 student ,can i ask some question about chemistry because i think stpm student should know how to solve this question,thank you very much^^
QUESTION:The molar mass of astatine is 210gmol.What is the relative actomic mass for astatine?
answer is 105,is 210 divide by 2 because astatine is located in group 17.then i want ask if for group 1,2,3,4,6,and 8 how to do lei??? |
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发表于 1-12-2009 01:24 AM
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因为一些element exist as diatomic gas，
比如group 16 and group 17.
其他的1,2,3,4是RAM = molar mass，
group 18 is inert gas，也是monoatomic的。 |
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楼主 |
发表于 1-12-2009 10:40 PM
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发表于 1-12-2009 10:50 PM
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sure is 105 meh  |
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楼主 |
发表于 2-12-2009 12:45 PM
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回复 4# morphv02c01 的帖子
SURE LAL...answer is 105 lal! |
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发表于 2-12-2009 01:11 PM
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better go check your facts  |
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