Formulae of gypsum and plaster of Paris differ by:
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a
1 molecule of H2O
b
12 molecule of H2O
c
32 molecules of H2O
d
2 molecules of H2O
answer is C.
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Detailed Solution
Plaster of Paris is made from Gypsum. Gypsum contains calcium sulfate dihydrate (CaSO4·2H2O) and plaster of Paris contains calcium sulfate hemihydrates (CaSO4·0.5 H2O)