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Question
Consider the following substances:
NaCl, Ca(OH)2, NaHCO3, NH3, Na2CO3, H2O, Cl2, CO2, CaSO4.2H2O, 2CaSO4.H2O, CaOCl2
Which compound represents plaster of Paris?
Solution
2CaSO4.H2O represents plaster of Paris as its chemical formula is CaSO4.1/2H2O.
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