Final answer:
The empirical formula for Barium chloride dihydrate is BaCl2·2H2O, which is the same as its chemical formula because the ratio of Barium to Chlorine to Hydrogen to Oxygen is already in the simplest whole numbers.
Step-by-step explanation:
The empirical formula for Barium chloride dihydrate is determined by the composition of the compound including the water molecules associated with it. The chemical formula for Barium chloride dihydrate is BaCl2·2H2O. To convert this to an empirical formula, we look at the ratio of the atoms in its simplest form. Since the Ba:Cl:H:O ratio is 1:2:4:2, the empirical formula remains the same as the chemical formula, BaCl2·2H2O because the ratio of atoms is already in the lowest possible whole numbers.