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First determine what’s needed. As we only need ¼ of a liter, we need only ¼ as much CuSO4, or ¼ x 0.200 mole = 0.0500 mole CuSO4·5H2O. Calculate the mass in grams of 0.0500 mole of CuSO4·5H2O. We need the molar mass of CuSO4·5H2O. The 5 waters of hydration are integral to the copper sulfate crystals, so they must be included in calculating the molar mass. copper 1 x 63.546 g/mol sulfur 1 x 32.065 g/mol oxygen 9 x 15.999 g/mol (4 from sulfate, 5 from 5H2O) hydrogen 10 x 1.0079 g/mol(from the 5 waters of hydration) copper(II) sulfate pentahydrate 249.681 g/mol