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> Chem! please help?

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Chem! please help?

Posted at： 2014-06-09　

Last one:) The mass of a quantity of NiCI2 is 24.6g. How many formula units are in the sample? A- 1.1 3 10^23 B-5.3 3 10^-21 C-1.9 3 10^27 D- 3.2 3 10^23 Explain it please? Thanks in advance.

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