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Vr=200cm3
dr- gęstosc rozpuszczalnika
d=m/v
m=d*v
mr=200cm3 * 0.8g/cm3 =160g
ms- masa substancji
ms = 1g
mr-r - masa roztowru
mr-r = mr + ms
mr-r = 160 +1 =161g
Cp - stężenie procentowe
Cp= ms*100%/mr-r wzor na steżenie procentowe
Cp= 1g*100%/161g= 0.62%
Pozdrawiam;)