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Byju's Answer
Standard XII
Chemistry
Abnormal Colligative Properties
75.2 g of C 6...
Question
75.2 g of
C
6
H
5
O
H
is dissolved in 1 kg of solvent of
K
f
=
14
K
m
o
l
a
l
−
1
. If the depression in freezing point is 7 K and the percentage of phenol that dimerises is x%, find the value of x.
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Solution
Δ
T
f
=
K
f
i
m
⇒
7
=
14
i
m
⇒
i
m
=
0.5
2
P
h
O
H
⇌
(
P
h
O
H
)
2
1
−
α
α
2
i
=
1
−
α
2
i
m
=
(
1
−
α
2
)
75.2
94
=
0.5
⇒
1
−
α
2
=
0.5
×
94
75.2
=
0.625
⇒
α
=
0.75
=
75
%
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8
Similar questions
Q.
75.2 g of
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Q.
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