# How many moles of iron, Fe, can be made from Fe_2O_3 by the use of 18 moles of carbon monoxide, CO in the reaction Fe_2O_3 + CO -> Fe+CO_2?

$F {e}_{2} {O}_{3} + 3 C O = 2 F e + 3 C {O}_{2}$
Hence 18 moles of CO can produce $\frac{2}{3} \cdot 18 = 12$ moles Fe