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200g ---- 100%
xg -----20%
x = 40g substancji
m s= 40g + 20g = 60g
mr-ru 2= 200g + 20g = 220g
Cp= 60g/ 220g *100% = 27,27%
masa substancji rozpuszczonej=20+0,2*200=20+40=60g
Cp=ms/mr*100%
Cp=60/220*100%=27,3%