2. A 0.240 g sample of a mixture of pure potassium permanganate and potassium dichromate salts was treated with excess KI in an acidic environment. To titrate the released iodine, 23.6 ml of sodium thiosulfate solution of concentration C1/Z = 0.2540 mol/l was used. Determine the mass fractions of KMnO4 and K2Cr2O7 in the mixture.

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