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Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100g of water?

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Let the mass of sodium sulphate required be = x g 

The mass of solution would be = (x +100) g 

x g of solute in (x + 100) g of solution 

20% = ×/x+100 x100 

20 x + 2000= 100 x 

80 x = 2000 

x = 2000/ 80 

= 25 g

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