The formula unit of the compound is the representative unit of the substance.
The term chemical formula has to do with the way that the atoms that compose the substance are arranged. The arrangement of the atoms in the chemical substance would help us to have an idea of how the compound appears.
Now we are looking at the compound barium chloride of which we know that it is an ionic substnace and since the substance is ionic in nature, we would talk about a formula unit of the compound as beings its representative unit in the crystal lattice of the substance.
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