hóa 9 đó

A

aloha147

pthh: 4A+xO2\Rightarrow2A2Ox goi sô mol kl A la:a
a -> ax/4
khôi lg oxi = 40% khôi lg kl nên co:
32ax/4=aM40% <=> M=20x
cho x chay tư 1->3 thi \Rightarrowkl A la Ca
 
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