1. The reaction of powdered aluminum and iron(II)oxide,

    2 Al_(S) + Fe₂0₃₍,₎         Al₂0₃₍₀ + 2 Fe_w

produces so much heat the iron that forms is molten. Because of this, railroads use the reaction to provide molten steel to weld steel rails together when laying track.

Suppose that in one batch of reactants 4.20 mol Al was mixed with 1.75 mol F e2 0 3 .

a)       Which reactant, if either, was the limiting reactant?

b)       Calculate the mass of iron (in grams) that can be formed from this mixture of reactants.

2. In order to convert iron ore into iron metal, it is commonly treated with carbon monoxide in the following reaction:

    Fe2O3 _(S) + 3 CO (g)                        2 Fe _(s) + 3 CO₂ (g)

a)      Which reactant is the limiting reactant?

b)      If 175 g of Fe₂O₃ is reacted with 87.9 g of CO, what is the maximum theoretical yield of iron metal?