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  4. The number of water molecules in gypsum and plaster of Paris respectively are

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Q. The number of water molecules in gypsum and plaster of Paris respectively are

Punjab PMETPunjab PMET 1999

Solution:

Molecular formula of gypsum and plaster of Paris is $ CaS{{O}_{4}}2{{H}_{2}}O $ and $ CaS{{O}_{4}}.\frac{1}{2}{{H}_{2}}O $ . Therefore, number of water molecules in gypsum and plaster of Paris is $ 2 $ and $ \frac{1}{2} $ respectively.