The balanced chemical equation for the reaction between potassium permanganate (KMnO4) and hydrochloric acid (HCl) to produce chlorine gas (Cl2), manganese(II) chloride (MnCl2), potassium chloride (KCl), and water (H2O) is:

2KMnO4 + 16HCl → 5Cl2 + 2MnCl2 + 2KCl + 8H2O