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70g subst-100g roztw
xg subst-640g roztw
x=448g
masa kwasu to 448g
V=0,4dm³=400cm³
ς=1,6g/cm³
cp=70%
mr=V*ς=400cm³*1,6g/cm³=640g
cp=ms*100%/mr
ms=cp*mr/100%=70*640/100=448g