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Question

What is the percentage composition of water in gypsum salt?


A
20.93%
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B
21.93%
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C
22.52%
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D
23.60%
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Solution

The correct option is A 20.93%

Molecular formula of gypsum is CaSO4.2H2O

Molecular mass of gypsum = Molecular mass of CaSO4 + 2 × Molecular mass of H2O
= (1 × 40) + (1 × 32) + (4× 16) + (2× 1) + (1× 16)
= 172u

Out of the 172u, (2 × 18)u is contributed by water.

Mass % of water = 36172 × 100
= 20.93%


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