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Molar mass of Cu(SO4)
1(Cu)+1(S)+4(O) = 1(63.55)+1(32.06)+4(16.00) = 159.61 g/mole
Molar mass of 5H2O
5[2(H)+1(O)] = 5[2(1.0079)+1(16.00)] = 90.079 g/mole
Total molar mass
159.61 + 90.079 = 249.689 g/mole
Xmoles = (.500L)(0.10M)
Xmoles = .05 moles
Xgrams = (.05 moles)(249.689 g/mole)
Xgrams = 12.484 g