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m-masa
V-objętość
etanol-C2H5OH
d=m/V
m=V x d
m=200 x 0,8
m=160g C2H5OH
Cp-steżenie procentowe
ms-masa substancji
mr-masa roztworu
Cp=ms/mr x 100%
Cp=1g/161g x 100%
Cp=0,62%