5. Ques.03 What vapour pressure of a
solution of benzene and toluene is
calculated, when mole fraction of benzene
is 0.2, vapour pressure of pure benzene and
pure toluene is 160 mm of Hg and 60 mm
of Hg respectively. *
Answers
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Answer:
For the equimolar solution of benzene and toluene, the mole fraction of benzene and toluene are 0.5 each.
Total pressure P=P
B
+P
T
=P
B
0
X
B
+P
T
o
X
T
P=160×0.5+60×0.5
P=110
The mole fraction of toluene in the vapour phase in contact with an equimolar solution of benzene and toluene.
Y
T
=
P
P
T
Y
T
=
P
P
T
o
X
T
Y
T
=
110
60×0.5
=0.27
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