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Write brief answers to the following question:
Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100g of water?
Let the mass of sodium sulphate required be = x g
The mass of solution would be = () g
x g of solute in (x + 100) g of solution
= x / (x + 100) x 100
20 x + 2000 =
= 2000
x = 2000 / 80
x = g.
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