A solution prepared by dissolving a 0.2541-g sample of electrolytic iron wire in acid was passed through

Question:

A solution prepared by dissolving a 0.2541-g sample of electrolytic iron wire in acid was passed through a Jones reductor. The iron(II) in the resulting solution required a 36.76-mL titration. Calculate the molar oxidant concentration if the titrant used was
(a) Ce4+ (product: Ce3+).
(b) MnO4- (product: Mn2+).
(c) IO3- (product: ICl2-).