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mr=400g
ms=Cp*mr/100%
ms=5*400/100
ms=20g
Dodano 100g rozpuszczalnika, więc;
ms=20g
mr=400g+100g=500g
Cp=ms*100%/mr
Cp=20*100/500
Cp = 4%
Stężenie procentowe powstałego roztwory wynosi 4%.