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Standard XII
Chemistry
Concentration Terms
The mole frac...
Question
The mole fraction of methanol in
4.5
molal aqueous solution is:
A
0.250
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B
0.125
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C
0.100
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D
0.075
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E
0.055
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Solution
The correct option is
D
0.075
Mole fraction,
x
=
w
m
w
m
+
W
M
(where,
w
and
m
represent the mass and molar mass of solute and
W
and
M
represent the mass and molar mass of solvent.)
1
x
=
w
m
+
W
M
w
m
1
x
=
1
+
W
×
m
M
×
w
×
1000
1000
1
x
=
1
+
1000
M
×
m
(
∵
M
o
l
a
l
i
t
y
,
m
=
w
×
1000
m
×
W
)
=
1
+
1000
18
×
4.5
(
∵
M
o
l
a
r
m
a
s
s
o
f
H
2
O
=
18
g
m
o
l
−
1
)
=
1
+
1000
81
=
1081
81
=
13.34
x
=
1
13.34
=
0.075
Hence, option D is correct.
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