niina Posts: 1, Reputation: 1 New Member #1 Nov 13, 2011, 02:05 PM
Iron(II) sulfate, FeSO4, is prescribed for the treatment of anemia.
How many moles of FeSO4 are present in a 390 mg tablet?
And I got 2.57Ã—10^âˆ’3 and it was right

but I didn't get how to do the 2nd part

How many iron(II) ions?
... atoms
 jcaron2 Posts: 986, Reputation: 204 Senior Member #2 Nov 14, 2011, 09:18 AM
You already successfully calculated the number of moles of FeSO4 molecules are present. Since there's only one Fe(II) ion per molecule, that means that there are 2.57x10^-3 moles of Fe(II) as well.

You know the number of moles, so how do you convert that into the number of atoms? Just multiply by 6.02x10^23, right?

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