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cp=7,2/60+20
cp=7,2/80 *100%
cp=0,09 *100%
cp=9%
Odp. Stężenie procentowe otzrymanego roztworu wynosi 9%
ms=60g
Cp1=12%
mh2o=20g
mr=60g+20g=80g
ms=60*12%=7,2g
Cp2=ms/mr*100%
Cp2=7,2/80g*100%
Cp2=0,9*100%
Cp2=9%