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mr=2kg
ms=Cp*mr/100%
ms=2*20/100
ms = 0,4kg soli
2kg roztworu - 0,4kg soli = 1,6kg wody
1kg - 1000g
czyli 2kg - 2000g
2000 g - 100%
x - 20 %
x = = =400g czyli tyle jest soli.
2000g - 400g = 1600 g wody :)