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Cp=ms/mr x 100%
mr=ms + m wody
0,2=x/250+x
50+0,2x=x
x=62,5g substancji
Cp=62,5/312,5 x 100%
Cp=20%
b)
0,25=x/120+x
30+0,25x=x
x=40g substancji
Cp=40/160 x 100%
Cp=25%