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VITEEE 2011 Solved Paper
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© examsnet.com
Question : 69
Total: 120
The freezing point of a solution composed of 10.0 g of KCl in 100 g of water is 4.5°C. Calculate the van't Hoff factor, i for this solution.
2.50
1.8
1.2
1.3
Validate
Solution:
Δ
T
f
=
i
K
f
m
m =
10
×
100
74.55
×
100
= 1.34 m
[Molecular Mass of KC1 = 74.55]
i =
Δ
T
f
K
f
m
=
4.5
°
C
(
1.86
°
C
∕
m
)
(
1.34
m
)
= 1.8
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