kemolalan suatu larutan 20% berat C2H3OH (Mr=46) adalah...,brainly

diketahui: Mr = 46
dalam 100 gr larutan C2H3OH terdapat 20% C2H3OH
C2H3OH = [tex] \frac{20}{100} x 100 gr[/tex] = 20 gr
air =100 - 20 = 80
ditanya: kemolalan larutan C2H3OH = .....?
jawab:
m =[tex] \frac{gr}{Mr} x \frac{1000}{P} [/tex]
= [tex] \frac{20}{46} x \frac{1000}{80} [/tex]
= [tex] \frac{10}{23} x \frac{100}{8} [/tex]
= 5.43