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0,791g------1cm³
xg---------20cm³
x=0,791*20
x=15,82g etanolu(ms)
2.Zamieniam objętość wody na masę (d = 1 g/cm³), więc
120cm³ wody = 120g wody(mw)
3. Obliczam masę roztworu(mr)
mr=ms+mw
mr=15,82+120
mr=135,82g
4. Obliczam Cp
Cp=ms*100%/mr
Cp=15,82*100%/135,82
Cp=11,65%