A 1.00g of sample of an iron ore containing Fe2O3 was dissolved in an acid and all the iron converted to Fe^2+. The solution was to rated with 90.40 cm^3 of 0.2M to give Me ^3+ and MnO4^- among the products.

Question

A 1.00g of sample of an iron ore containing Fe2O3 was dissolved in an acid and all the iron converted to Fe^2+. The solution was to rated with 90.40 cm^3 of 0.2M to give Me ^3+ and MnO4^- among the products.
a) Balance equation using the iron -electron method.
b) Calculate the mass of Fe2O3 in the sample
c) What percentage of ore was Fe2O3