Final answer:
Each substance provided is classified based on its composition: PCl₅ is a molecular compound, NaNO₃ and Ba₃N₂ are ionic compounds, and HClO₃ and HBr are molecular compounds (acids).
Step-by-step explanation:
The question asks us to classify substances into categories of compounds which include ionic compounds, molecular compounds, and others. Here's how each substance would be classified:
PCl₅ - Molecular compound (Phosphorus pentachloride is composed of nonmetal atoms bonded covalently).
NaNO₃ - Ionic compound (Sodium nitrate consists of a metal combined with a polyatomic ion).
HClO₃ - Molecular compound (Chloric acid is a type of acid, which is generally molecular when in non-dissociated form).
HBr - Molecular compound (Hydrobromic acid, like chloric acid, is a molecular compound in its non-dissociated form).
Ba₃N₂ - Ionic compound (Barium nitride is made up of a metal and a nonmetal).