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m r-ru = 200g + 50g + 20g = 270g
Cp. = 60g *100%/ 270g = 22,22%
oDP. Stężenie procentowe wynosi 22,22%
ms-masa substancji
mr=masa roztworu
mw-masa wody
Cp=20%
mr=200g
Cp=ms/mr*100%
ms=200*20/100%
ms=40g
ms=40g+20g=60g
mw=160+50=210
mr=ms+mw
mr=60+210=270g
Cp=ms/mr*100%
Cp=60/270*100%=22,2%