4. To 2.50 ml of KClO3 solution was added 25.00 ml of 0.1200 M FeSO4 solution, the excess of which was then titrated with 5.00 ml of 0.1100 N. KMnO4 solution. Calculate the mass fraction (%) of KClO3 in the solution if the density of this solution is ρ = 1.020 g/ml.

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