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Cp=stężenie procentowe
ms=masa substancji
mr=masa roztworu
6,25%=(ms/ms+150)*100%
6,25/100=ms/ms+150
ms=0,0625(ms+150)
ms-0,0625ms=9,375
0,9375ms=9,375
ms=9,375/0,9375
ms=10g