What is the percentage composition of water in Gypsum salt?

25 %

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21 %

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30 %

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19 %

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Solution

The correct option is B
21 %

Gypsum ( $C a S O_{4} .2 H_{2} O)$ is a hydrated salt and contains water of crystallisation.

$H_{2} O$ = $2 \times 1 + 16$ = 18 g

$2 H_{2} O$ = $2 \times 18$ = 36 g

$C a S O_{4}$ = $40 + 32 + 64$ = 136 g

Molecular weight of $C a S O_{4} .2 H_{2} O$ = 136 + 36 = 172 g

Percentage = $\frac{36}{172} \times 100$ = 20.93%

$C a S O_{4} .2 H_{2} O$ = 20.93%

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