13. From a sample of the alloy weighing 1.2060 g, iron was transferred to Fe (II) and titrated with 1.00 N. cerium sulfate solution (IV). Calculate the percentage of iron in the alloy from the following potentiometric titration results:
V Ce(SO4)2, ml 2.0 10.0 18.0 19.8 20.0 20.2 22.0
E, mV 712 771 830 889 1110 1332 1391

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