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Molecular Mass

What is the p...

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

Molecular weight - $C a S O_{4} .2 H_{2} O$ - 172g

Percentage - $\frac{2 * 18}{172} \times 100$

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