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Byju's Answer
Standard VIII
Chemistry
Solvent and Solute
Find mass
Question
Find mass % of 10 m of aqueous solution of urea. If molar mass of urea is 60 g/mol and density of solution is 1.2
g
c
m
−
3
.
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Solution
We have,
molality of urea solution = 10m
that means,
1000g of water contain urea = 10 moles =
10
∗
60
=
600
g
of urea
so, mass of solution =
s
o
l
u
t
e
+
s
o
l
v
e
n
t
=
1000
+
600
=
1600
g
so,
m
a
s
s
=
m
a
s
s
o
f
s
o
l
u
t
e
m
a
s
s
o
f
s
o
l
u
t
i
o
n
∗
100
=
600
1600
∗
100
=
37.5
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1
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