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When gypsum is totally dehydrated, what ...

When gypsum is totally dehydrated, what is the percentage weight loss ? 

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GMW of gypsum, `CaSO_(4).2H_(2)O = 172 g`
weight of water of hydration`= 2 xx 18 = 36 g`
172 g loses 36 g of water on dehydration Percentage weight loss `=36xx(100)/(172)=20.9`
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