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a 0.755 g sample of hydrated copper (II) sulfate was heated carefully until it had changed completely to anyhydous copper(II) sulfate (CuSO4) with a mass of 0.438 g. Determine the value of x. [This number is called the number of waters of hydration of copper (II) sulfate. It specifies the number of water molecules per formula unit in the hydrated crystal.]

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