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Each copper(II) sulfate unit is associated with five water
molecules in crystalline copper(II) sulfate pentahydrate
(CuSO4
·
5H2O). When this compound is heated in air above 100
°
C, it loses the water molecules and its blue color:
CuSO4
·
5H2O
→
CuSO4 + 5H2O
(blue compound)
If 10.08 g of CuSO4 remain after heating 15.76 g of
the blue compound, calculate the number of moles of H2O
originally present in the compound.
(?) moles of water