Some antacid medications use aluminum hydroxide to counteract the hydrochloric acid in the stomach.

Al(OH)₃ + 3HCl → AlCl₃ + 3H₂O

1. If a dose of antacid containing 28 g Al(OH)₃ reacts to produce 44 g AlCl₃, what is the percentage yield of AlCl₃?

Aluminum reacts with excess copper(II) sulfate according to the reaction given below.

Al(s) + CuSO₄(aq) → Al2(SO₄)₃(aq) + Cu(s) (unbalanced)