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g NaOH = 40 gram
g pelarut(air) = 100-40 = 60 gram
Dit : Molalitas dan fraksi mol
Jawab :
-Molalitas = g.NaOH/mr x 1000/g.pelarut
= 40/40 x 1000/60 = 16,67 m
-Fraksi mol(x)
mol NaOH = gram/mr = 40/40 =1 mol
mol pelarut = gram/mr = 60/ 18= 3,3 mol
x NaOH = mol NaOH/(molNaOH+mol pelarut) = 1/4,3 = 0,2326
x pelarut = 1-xNaOH = 1- 0,2326 = 0,7674
No.4 kurang tahu maap ya hehe