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Solution:Concept: Copper sulphate is hygroscopic by nature. When copper sulphate and water interact, a hydrated version of the salt is created. Pentahydrate copper sulphate is created when copper sulphate combines with five water molecules.
The molecular weight of water The Molecular weight of the Percentage of water of crystallization-
Hence, the percentage of water of crystallization is 36%.
Hence, the correct answer is option 3.