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Question
Chemistry
What will be the mole fraction of ethanol in a sample of spirit containing 85% ethanol by mass?
Q. What will be the mole fraction of ethanol in a sample of spirit containing 85% ethanol by mass?
2522
202
Solutions
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A
0.69
29%
B
0.82
25%
C
0.85
38%
D
0.60
8%
Solution:
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
Mass of
C
2
H
5
O
H
=
85
g
Molar mass of
C
2
H
5
O
H
=
46
g
/
m
o
l
n
C
2
H
5
O
H
=
46
85
=
1.85
m
o
l
Mass of water
=
100
−
85
=
15
g
n
H
2
O
=
18
15
=
0.833
m
o
l
x
C
2
H
5
O
H
=
1.85
+
0.833
1.85
=
2.683
1.85
=
0.69