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Tardigrade
Question
Chemistry
A 5.2 molal aqueous solution of methyl alcohol, CH 3 OH is supplied. What is the mole fraction of methyl alcohol in the solution?
Q. A
5.2
molal aqueous solution of methyl alcohol,
C
H
3
O
H
is supplied. What is the mole fraction of methyl alcohol in the solution?
5784
180
Solutions
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A
1.100
B
0.090
C
0.086
D
0.050
Solution:
Molality
=
Mass of solvent (in
k
g
)
Moles of solute
=
1
k
g
H
2
O
5.2
m
o
l
C
H
3
O
H
[
1
k
g
=
1000
g
]
n
1
(
C
H
3
O
H
)
=
5.2
,
n
2
(
H
2
O
)
=
18
1000
=
55.56
∴
n
1
+
n
2
=
5.20
+
55.56
=
60.76
m
o
l
∴
x
C
H
3
O
H
=
n
1
+
n
2
n
1
=
60.76
5.2
=
0.086