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mr=250g+15g=265g
Cp=?
Cp=ms/mr*100%=65g/265g*100%=0,245*100%=24,5%
mr2=250g
Cp1=20%
m=20g
obliczm masę substancji(ilość soli w pierwszym roztworze o Cp=20%)
ms1=0.2*250=50g
ms2=50+15=65g
mr2=250+15=265g
Cp2=65/265*100%=24.5%