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Byju's Answer
Standard XII
Chemistry
Concentration Terms
The molality ...
Question
The molality of the
3
M
solution of methanol if the density of the solution is
0.9
g
.
c
m
−
3
is:
A
3.73
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B
3.0
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C
3.33
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D
3.1
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E
3.2
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Solution
The correct option is
A
3.73
3 M solution means 3 moles of methanol in 1L of solution
Since Density
=
m
a
s
s
v
o
l
u
m
e
Mass of the solution
=
0.9
×
1000
=
900
g
r
a
m
s
Mass of solvent
=
900
−
(
3
×
32
)
=
804
g
r
a
m
s
Molality
=
m
o
l
e
s
M
a
s
s
o
f
s
o
l
v
e
n
t
i
n
K
g
=
3
0.804
=
3.73
m
m
=
3.728
≈
3.73
m
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0
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