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Standard XII
Chemistry
Units and Dimensions
99.What is th...
Question
99.What is the amount of CaCl2 (molar mass = 111 g mol−1) which must be added to 500 g of water to lower its freezing point by 2 K, assuming CaCl2 is completely dissociated
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Q.
Calculate the amount of
C
a
C
l
2
(molar mass
=
111
g
m
o
l
−
1
)
which must be added to 500 g of water to lower its freezing point by 2K, assuming
C
a
C
l
2
is completely dissociated.
(
K
f
for water
=
1.86
K
k
g
m
o
l
−
1
)
.
Q.
Calculate the amount of
C
a
C
l
2
(molar mass = 111g/mol) which must be added to 580g of water so that freezing point lower by 2K, assuming
C
a
C
l
2
is completely dissociated:
[
K
f
for water = 1.86 K kg/mol].
Q.
Calculate the amount of
C
a
C
l
2
(molar mass
=
111
g
m
o
l
−
1
)
which must be added to 500 g of water to lower its freezing point by 2K, assuming
C
a
C
l
2
is completely dissociated.
(
K
f
for water
=
1.86
K
k
g
m
o
l
−
1
)
.
Q.
0.01 M solution of
K
C
l
and
C
a
C
l
2
are prepared in water. The freezing point of
K
C
l
is found to be
−
2
o
C
. What is the freezing point of
C
a
C
l
2
to be completely ionised?
Q.
What mass of ethylene glycol (molar mass 62.0 g
m
o
l
−
1
) must be added to 5.50 kg of water to lower the freezing point of water from
0
0
C to -
10.0
0
C
?
(
K_f
f
o
r
w
a
t
e
r
=
1.86
K
k
g
mol^{-1}$).
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