13. A weighed portion of ferrous sulfate FeSO4*7H2O weighing 7.1500 g was dissolved in a 250 cm3 volumetric flask, the solution was brought to the mark. For 25.00 cm3 of this solution, 24.48 cm3 of 0.0968 N was consumed. KMnO4 solution. What percentage of FeSO4*7H2O does the sample contain?

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