Over the years, the thermite reaction has been used for welding railroad rails, in incendiary bombs, and to ignite solid-fuel rocket motors. The reaction is the following.

Cr2O3(s) + 2 Al(s) → 2 Cr(l) + Al2O3(s)
What masses of chromium(III) oxide and aluminum must be used to produce 15.4 g of chromium?
What is the maximum mass of aluminum oxide that could be produced?