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Cp=ms/mr x 100%
0,15=x/3000g + x
450g+0,15x=x
x=539,4g
masa roztworu:3539,4g
masa soli :539,4g
Cp=539,4/3539,4 x 100%
Cp=15%
2.
0,25=ms/200
ms=50g soli
200-50=150g wody