Vapour pressure of water at 50°C is 92 mm. A solution of urea containing 18.2 g of in 100 ml
water has a vapour pressure of 87 mm at the same temperature Calculate the molecular weight
of urea.
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0
Answer:
Correct option is
C
57.05
We have,
P
B
0
P
B
o
−P
t
=x
A
92
5
=
n
A
+n
B
n
A
=
x+5.55
x
we get x = 0.316 moles
molecular weight =
moles
weight
molecular weight of urea = 57.05
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