Calculate the mass of sodium sulphate required to prepare its 20% (mass

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

Answer: In a 20% solution containing 100 g water; the mass percentage of water = 100 – 20 = 80% 

Hence; to prepare 20% (w/w) solution in 100 gram

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