Q: An iron ore sample contains Fe2O3 plus other impurities. A 756-g sample of impure iron ore is heated with excess carbon, producing 468 g of pure iron by the following reaction. Fe2O3(s) + 3 C(s) 2 Fe(s) + 3 CO(g)

What is the mass percent of Fe2O3 in the impure iron ore sample?

(Assume that Fe2O3 is the only source of iron and that the reaction is 100% efficient.)

A: _ %