Calculate amount of urea is dissolved in 18 g
water to form 10 % solution of urea Calculate
the mass of urea
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Answer:
18.2 g of urea is dissolved in 100g of water at 50
o
C. The lowering of vapour pressure produced is 5 mm Hg. Calculate the molecular mass of urea. The vapour pressure of water at 50
o
C is 92 mm Hg.
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ANSWER
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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