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Which best compares 1 mol of sodium chloride to 1 mol of aluminum chloride?
A. Both have the same molar mass.
B. Both have the same number of ions.
C. Both are made up of molecules.
D. Both are made up of formula units.
Answer:- D. Both are made up of formula units.
Sodium chloride (NaCl) and aluminum chloride (AlCl₃) are both ionic compounds, meaning they are made up of ions that form a crystal lattice structure. The term “formula unit” refers to the smallest repeating unit of an ionic compound that represents the whole compound. For NaCl, the formula unit is NaCl (one sodium ion and one chloride ion), and for AlCl₃, the formula unit is AlCl₃ (one aluminum ion and three chloride ions).