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Chemistry
Rectified spirit contains 95% ethanol by mass, the mole-fraction of ethanol is
Q. Rectified spirit contains 95% ethanol by mass, the mole-fraction of ethanol is
2405
204
NTA Abhyas
NTA Abhyas 2020
Some Basic Concepts of Chemistry
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A
0.118
0%
B
0.811
34%
C
0.999
31%
D
0.881
34%
Solution:
100 g ethanol solution contains 95 g of ethanol
(
C
2
H
5
O
H
)
. Therefore, the mass of water is (100 - 5) g = 5 g.
So mole fraction of ethanol
X
C
2
H
5
O
H
=
n
C
2
H
5
O
H
+
n
H
2
O
n
C
2
H
5
O
H
=
(
95/46
)
+
(
5/18
)
95/46
=
2.065
+
0.2778
2.065
=
0.881