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Homework Help: Total Mols of Ions

  1. Sep 27, 2009 #1
    1. The problem statement, all variables and given/known data

    How many total moles of ions are released when the following sample dissolves completely in water?

    2.63 g of CuSO4 * 5H2O

    2. Relevant equations

    159.611 g / mol of CuSO4

    3. The attempt at a solution

    I tried doing 2.63 g / [159.611 g / mol] to get .016477 mol of CuSO4. and since there are two ions, Cu2+ and SO42- I just multipled the answer by two and got .032955 mol ions

    But that isn't the answer. Am I missing anyhting?
  2. jcsd
  3. Sep 27, 2009 #2


    User Avatar

    Staff: Mentor

    Yes, molar mass of hydrate is not that of anhydrous part.

  4. Sep 27, 2009 #3
    THANKS! That solved my problem. For reference: the answer is .0211 mol ions
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