The chemical formula for hydrated gypsum is CaSO4.2H2O, indicating it contains two water molecules as water of crystallization per formula unit.
What is the chemical formula for hydrated gypsum, and how many water molecules does it contain?
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The chemical formula for hydrated gypsum is CaSO4 · 2H2O. This indicates that each unit of calcium sulfate is associated with two molecules of water, making it dihydrate.