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The dot is used in formulas where water molecules can only be bound with intermolecular interactions like hydrogen bonds, but they still exist in the structure in a stoichiometric ratio, hence the stoichiometric coefficient before the H20
Yes, to go off the previous comment, the dot means the compound is a hydrate where the water molecules are bound chemically to the rest of the compound. When doing problems with hydrates, you add the molar mass of the water molecules to the molar mass of the rest of the compound to find the molar mass of the entire hydrate.
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