Q. Two liquids A and B form an ideal
solution. The mixture has a vapour
pressure of 400 mm at 300 K when
mixed in the molar ratio of 1:1 and a
vapour pressure of 350 mm when mixed
in the molar ratio of 1:2 at the same
temperature. The vapour pressures of
the two pure liquids A and B
respectively are
(a) 550 mm, 250 mm
(b) 350 mm, 450 mm
(c) 350 mm, 700 mm
(d) 500 mm, 500 mm
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Answer:
Total pressure
P=pA
0
A
2
+pB
0
B
2
for case (i)
400p=pA
0
2
1
+pB
0
2
1
{molarratioθ=1:1}
pA
0
+pB
0
=800
for case (ii)
350=pA
0
3
1
+pB
0
3
2
{molarrationθ=1:2}
pA
0
+2pB
0
=1050.....(2)
from (1) and (2)
pA
0
=550mm pB
0
=250 mm
Explanation:
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