Ile gramów wody dodano do 100g , 70 % roztworu etanolu.Jezeli po rozcienczeniu otrzymano roztwór 40 %?
mw=? mr1=100g Cp1=70% Cp2=40%
ms=mr1*Cp1/100%
ms=70g
mr2=ms*100%/Cp2
mr2=70g*100%/40%
mr2=175g
mw=mr2-mr1
mw=175g-100g
mw=75g
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mw=? mr1=100g Cp1=70% Cp2=40%
ms=mr1*Cp1/100%
ms=70g
mr2=ms*100%/Cp2
mr2=70g*100%/40%
mr2=175g
mw=mr2-mr1
mw=175g-100g
mw=75g