Which best compares 1 mol of sodium chloride to 1 mol of aluminum chloride?

One mole of any substance contains about 6.02 × 10²³ representative particles. Sodium chloride and aluminum chloride are ionic compounds, so their representative particles are called formula units, not molecules. Thus, 1 mol of each contains 6.02 × 10²³ formula units. They do not have the same number of ions per formula unit or the same molar mass.

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