41. Solution to Chemistry Problem

436. After dissolving a 1.257 g sample of steel, the chromium contained in the sample was converted into potassium dichromate K2Cr2O7. 35.00 ml of Mohr´s salt solution were added to the resulting solution, the excess of Mohr´s salt was titrated with 16.15 ml of KMnO4 solution with a mass concentration of 1.500*10-3 g/ml. Calculate the mass fraction of chromium in the original sample of steel if 25.00 ml of Mohr´s salt solution are equivalent to 24.15 ml of KMnO4 solution.