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Because of water of crystallization.
Nomenclature :In molecular formulas water of crystallizationcan be denoted in different ways:
"hydrated compound·nH2O" or "hydrated compound×nH2O"This notation is used when the compound only contains lattice water or when the crystal structure is undetermined. For example Calcium chloride: CaCl2·2H2O"hydrated compound(H2O)n"A hydrate with coordinated water. For example Zinc chloride: ZnCl2(H2O)4Both notations can be combined as for example in copper(II) sulfate: [Cu(H2O)4]SO4·H2O
Nomenclature :In molecular formulas water of crystallizationcan be denoted in different ways:
"hydrated compound·nH2O" or "hydrated compound×nH2O"This notation is used when the compound only contains lattice water or when the crystal structure is undetermined. For example Calcium chloride: CaCl2·2H2O"hydrated compound(H2O)n"A hydrate with coordinated water. For example Zinc chloride: ZnCl2(H2O)4Both notations can be combined as for example in copper(II) sulfate: [Cu(H2O)4]SO4·H2O
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