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Tardigrade
Question
Chemistry
What amount of CaCl2 (i = 2.47) is dissolved in 2 litres of water so that its osmotic pressure is 0.5 atm at 27 °C?
Q. What amount of
C
a
C
l
2
(
i
=
2.47
)
is dissolved in
2
litres of water so that its osmotic pressure is
0.5
a
t
m
at
27
°
C
?
3577
188
Solutions
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A
3.42
g
20%
B
9.24
g
20%
C
2.834
g
24%
D
1.820
g
36%
Solution:
π
=
i
CRT
=
i
V
n
RT
n
=
i
×
R
×
T
π
×
V
=
2.47
×
0.0821
×
300
0.5
×
2
=
0.0164
m
o
l
Amount of
C
a
C
l
2
=
n
×
M
=
0.0164
×
111
=
1.820
g