2 Fe2O3 + 3 C 4 Fe + 3 CO2 Iron(III) oxide is reduced to iron by reacting with carbon. How many moles of carbon would you need if you need 6.3e+05 moles of iron to make the car? WebAssign will check your answer for the correct number of significant figures. How many moles of iron(III) oxide would you need? WebAssign will check your answer for the correct number of significant figures.