Mining companies extract iron from iron ore according to the following balanced equation: Fe2O3(s)+3CO(g)2Fe(s)+3CO2(g) In a reaction mixture containing 167 g Fe2O3 and 85.8 g CO , CO is the limiting reactant. Calculate the mass of the reactant in excess (which is Fe2O3 ) that remains after the reaction has gone to completion. Express the mass with the appropriate units.