Calculating Total Moles of Ions from CuSO4*5H2O

[carlodelmundo]

Homework Statement

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

2.63 g of CuSO₄ * 5H₂O

Homework Equations

159.611 g / mol of CuSO₄

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 SO₄^2- I just multipled the answer by two and got .032955 mol ions

But that isn't the answer. Am I missing anyhting?

 

[Borek]

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

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[carlodelmundo]

THANKS! That solved my problem. For reference: the answer is .0211 mol ions