64. Solving a chemistry problem

1. The density of the potassium chlorate solution (KClO3) is 1.02 g/ml. To 25.0 ml of the solution was added 25.0 ml of FeSO4 solution with a molar concentration of 0.120 mol/l. For the titration of the FeSO4 residue, 4.95 ml of a KMnO4 solution with a molar concentration of the equivalent of 0.011 mol/l went. Calculate the mass fraction of KClO3 in the solution.