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What is the percent by mass of water in CuSO₄ • 5H₂O? (note: molar masses are CuSO₄ = 159.6 g/mol; H₂O = 18.0 g/mol.)
a. 36.1% water
b. 30.5% water
c. 10.1% water
d. 22.8% water