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What is the percent weight composition o...

What is the percent weight composition of water in plaster of paris?

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Chemical formula of plaster of paris is ` CaSO_(4). (1)/(2) H_(2)O`
Formula weight of plaster of paris = 136 + 9 = 145
145 grams of plaster of paris = 9 grams water
100 grams of plaster of paris = ?
% weight composition of water `= (9xx100)/(145) = 6.2`
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