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When copper(II) sulfate pentahydrate is heated in air above 100C, it loses the water molecules and...

When copper(II) sulfate pentahydrate is heated in air above 100C, it loses the water molecules and also its blue color.

CuSO4•5H2O—>CuSO4 + 5H2O

If 9.75 g of CuSO4 are left after heating 15.25 g of the blue hydrate, calculate the number of moles of water originally present in 15.25 g of the hydrate.
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