3. From 4.0500 g of crystalline copper sulfate (CuSO4*5H2O) 200.00 ml were prepared. For the reaction of 20.00 ml of this solution, 15.00 ml of a 0.1 mol/l solution of sodium thiosulfate (Na2S2O3) were consumed. Determine the percentage of copper sulfate in the analyzed sample.

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