20. From a 2.086 g sample of steel, vanadium was transferred into solution in the form of VO2 and titrated with a 0.10 N solution of iron (II) sulfate: VO2 Fe2 2H = VO2 Fe3 H2O. Calculate the percentage of vanadium in steel from the following potentiometric titration results:
V (FeSO4), ml 2.0 10.0 18.0 19.8 20.0 20.2 22.0
E, mV 1058 1000 940 901 885 841 830

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