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cp1=100%
mr2=300g
cp2=70%
mr3=240g
cp3=5%
cp=?
obliczam masę substancji w każdym roztworze
cp=ms*100%/mr
ms1=cp1*mr1/100%=100%*100g/100%=100g
ms2=cp2*mr2/100%=70%*300g/100%=210g
ms3=cp3*mr3/100%=5%*240g/100%=12g
ms=ms1+ms2+ms3=100g+210g+12g=322g
mr=mr1+mr2+mr3=100g+300g+240g=640g
cp=ms*100%/mr=322g*100g/640g=50,3%