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April 2, 2015

Homework Help: Chemistry

Posted by Shadow on Tuesday, January 29, 2013 at 11:19pm.

The problem ask what is the mass of iron(iii) chloride contains 2.35 x 10^23 chloride ions.

I understand the molar mass is 162.20 g/mol.
- 2.35 x 10^23 chloride ions would be around 0.39 moles.
- The work that my teacher gave me is
0.39 moles * (1 mol FeCl3 / 3 mol chloride ions) * (162.20 g FeCl3 / 1 mol FeCl3)

-What I don't understand is how is why is the moles of chloride ions being *(1 mol FeCl3 / 3 mol chloride ions)- Could someone explain this to me? Thanks

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