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Standard XII
Chemistry
Depression in Freezing Point
44. If 2 mole...
Question
44. If 2 moles of A is added to 1 lg water and solution boils at 100.52^° C then calculate percentage of association or dissociation for A ( Kb for H2O = 0.52 K/molal)
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Q.
If any solute '
A
' dimerises in water at 1 atm pressure and the boiling point of this solution is
100.52
∘
C
. If 2 moles of
A
is added to 1 kg of water and
k
b
for water is
0.52
∘
C
/
m
o
l
a
l
, calculate the percentage association of
A
?
Q.
A solute A dimerizes in water. The boiling point of a 2 molal solution of A is 100.52 ºC. The percentage association of A is________.(Round off to the nearest integer.)
[Use :
K
b
for water =
0.52
K
k
g
m
o
l
−
1
Boiling point of water = 100 ºC]
Q.
10
g
of a non-electrolyte solute
(
M
=
60
g/mol
)
is added to
250
g
of water. The boiling point of the solution is (
K
b
for water is
0.52
K kg mol
–
1
and boiling point of water
=
373.15
K
)
[0.77 Mark]
Q.
Calculate the molal elevation constant,
k
b
for water and the boiling point of 0.1 molal urea solution. Latent heat of vaporisation of water is 9.72 kcal mol
−
1
at 373.15 K.
Q.
A solution of urea in water has boiling point of
100.15
o
C
.
Calculate the freezing point of the same solution if
K
f
and
K
b
for water are 1.87 K kg
m
o
l
−
1
and 0.52 K kg
m
o
l
−
1
respectively.
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