Tardigrade
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Tardigrade
Question
Chemistry
The vapour pressures of ethanol and methanol are 44.5 mmHg and 88.7 mmHg respectively at the same temperature. An ideal solution is formed by mixing 60 g of ethanol and 40 g of methanol. The mole fraction of methanol in the vapour phase is
Q. The vapour pressures of ethanol and methanol are
44.5
mm
H
g
and
88.7
mm
H
g
respectively at the same temperature. An ideal solution is formed by mixing
60
g
of ethanol and
40
g
of methanol. The mole fraction of methanol in the vapour phase is
1448
241
Solutions
Report Error
A
0.66
B
0.55
C
0.11
D
0.33
Solution:
Mole of
C
H
3
O
H
=
32
40
=
1.25
Mole of
C
H
3
C
H
2
O
H
=
46
60
=
1.304
Let
C
H
3
O
H
→
A
,
C
2
H
5
O
H
→
B
X
A
=
n
A
+
n
B
n
A
=
1.25
+
1.304
1.25
=
0.49
∴
X
B
=
0.51
∴
P
T
=
P
A
o
X
A
+
P
B
o
X
B
=
88.7
×
0.49
+
44.5
×
0.51
P
T
=
43.480
+
2.695
=
66.175
∴
P
A
=
43.48
;
∴
X
A
=
P
T
P
A
=
66.175
43.48
=
0.66