Suatu larutan NaOH (Mr = 40g/mol) memiliki 20% tentukan kemolalan larutan NaOH tersebut
Diketahui : Mr = 40
dalam 100 gr larutan NaOH terdapat 20% NaOH
NaOH = = 20 gr
air = 100 – 20 = 80
ditanya: kemolalan larutan NaOH = ……?
jawab:
m =
=
=
= 6.25 molal