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AIEEE 2005 Chemistry Solved Paper
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© examsnet.com
Question : 31
Total: 74
Benzene and toluene form nearly ideal solutions. At
20
∘
C
, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at
20
∘
C
for a solution containing
78
g
of benzene and
46
g
of toluene in torr is
50
25
53.5
37.5
Validate
Solution:
Given, Vapour pressure of benzene
=
75
torr
Vapour pressure of toluene
=
22
torr
mass of benzene in
=
78
g
hence moles of benzene
=
78
78
=
1
mole
(
mol
. wt of benzene
=
78
)
mass of toluene in solution
=
46
g
hence moles of toluene
=
46
92
=
0.5
mole
Total moles of benzene and toluene
=
1.5
mol
now partial pressure of benzene
=
P
b
∘
×
X
b
=
75
×
1
1
+
0.5
=
75
×
1
1.5
=
75
×
2
3
=
50
torr
© examsnet.com
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