Jawabanmu

2014-08-31T21:56:58+07:00
BaCl ------------> Ba^+ + Cl^-                    (i = 2)
ΔTb = 101,56 - 100 = 1,56

ΔTb = kb . m . i
1,56 = 0,52 .  \frac{gr}{mr} .  \frac{1000}{pelarut}
1,56 = 0,52 .  \frac{gr}{172,5} .  \frac{1000}{250}
1,56 = 0,52 .  \frac{gr}{172,5} . 4
269,1 = 2,08 gr
gr = 129,375
1 5 1
2014-08-31T22:05:27+07:00
Diket : tb= 100 c , maka Δtb=101,56-100=1,56
mr bacl= 172,5 ; i=2 karna BaCl termasuk larutan elektrolit

ΔTb= Kb.m.i
1,56=0,52.m.2
m= 1,56/1,04
m= 1,5

m= gr/mr x 1000/gp
1,5= x/172,5 x 1000/250
258,75=x . 4
x=64,6875

coba cek hasilnya, kalo caranya insyaAllah udah bener.