A mineral containing iron was analyzed by dissolving a 1.1278g sample in concentrated HCI. The resulting solution was diluted with water and the iron (IlI) was precipitated as the hydrated oxide Fe203.xH20 by the addition of NH3 After filtration and washing, the residue was calcined at high temperature to yield 0.4988g of pure Fe203 (159 69 g / mol) Calculate a) The percentage of Fe (55,847 g/ mol) b) The percentage of Fe304 (231.54 g /mol) in the sample