3(4). Determine the mass fraction (%) of indifferent impurities in a sample of copper sulfate if, after dissolving its sample weighing m(CuSO4-5H20) g in nitric acid and electrolysis of the resulting solution, m(Cu) g is isolated on the platinum cathode:
Option 4
m(CuSO4-5H20), g 0.5807
m(Cu), g 0.1463

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