32.86g of an iron oxide contain 22.96 of iron .what is the e

mass of O2 = 32.86- 22.96 =9.9g
mole ratio of Fe : O = 22.96/55.8 : 9.9/16
=0.4:0.6
= 2 : 3
Empirical formula of iron oxide is Fe2O3.