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    niina's Avatar
    niina Posts: 1, Reputation: 1
    New Member

    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 2.57×10^−3 and it was right

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

    How many iron(II) ions?
    ... atoms
    jcaron2's Avatar
    jcaron2 Posts: 986, Reputation: 204
    Senior Member

    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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