Jawabanmu

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2014-08-26T23:39:23+07:00
Gr = 12,42
gr plarut = 300
kf = 2,62
Δtf = titik beku plarut - titik beku larutan
     = 5,5 - 4,8
   = 0,7

penyelesaian =

Δtf = kf x m
0,7 = 2,62 x gr/mr x 1000/p
0,7 = 2,62 x 12,42/mr x1000/300
0,7 = 32,5404/mr x 3,33
0,7 = 108, 35/mr
0,7mr = 108,35
mr = 108,35/0,7
mr =154,78