(D) The chemical formula of gypsum is $CaSO_4 \cdot 2H_2O$,which contains $2$ water molecules.The chemical formula of plaster of Paris is $CaSO_4 \cdo

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(D) The chemical formula of gypsum is $CaSO_4 \cdot 2H_2O$,which contains $2$ water molecules.The chemical formula of plaster of Paris is $CaSO_4 \cdot \frac{1}{2}H_2O$,which contains $0.5$ water molecules.The difference in the number of water molecules is $2 - 0.5 = 1.5$ or $1\frac{1}{2}$.