What is the $%$ of water in the dehydrated salt of $C a C l_{2} .2 H_{2} O$ dehydrate salt?

66.67

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32.47

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24.49

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12.26

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Solution

The correct option is C 24.49
molar mass of calcium chloride dehydrate = $\frac{147 g}{m o l}$
$%$ of water hydration in calcium chloride dehydrate = $\frac{(36 \times 100)}{147} = 24.49$ %

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