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AIEEE 2007 Solved Paper
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© examsnet.com
Question : 20
Total: 118
A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of
290
mm
at
300
K
. The vapour pressure of propyl alcohol is
200
mm
. If the mole fraction of ethyl alcohol is
0.6
, its vapour pressure (in
mm
) at the same temperature will be
360
350
300
700
Validate
Solution:
P
A
∘
=
?
Given
P
B
∘
=
200
mm
,
x
A
=
0.6
x
B
=
1
−
0.6
=
0.4
,
P
=
290
P
=
P
A
+
P
B
=
P
A
∘
x
A
+
P
B
∘
x
B
⇒
290
=
P
A
∘
×
0.6
+
200
×
0.4
∴
P
A
∘
=
350
mm
© examsnet.com
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