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Byju's Answer
Standard XII
Chemistry
Molality
20g of NaOH...
Question
20
g of
N
a
O
H
(Molar mass
=
40
g
m
o
l
−
1
) is dissolved in
500
c
m
3
of water. Molality of resulting solution is:
A
0.1
m
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B
0.5
m
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C
1.5
m
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D
1.0
m
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Solution
The correct option is
B
1.0
m
We know,
Molality
=
m
o
l
e
s
w
e
i
g
h
t
o
f
s
o
l
v
e
n
t
(
k
g
)
Molality
=
(
w
e
i
g
h
t
m
o
l
e
c
u
l
a
r
w
e
i
g
h
t
)
×
1000
(
v
o
l
u
m
e
×
d
e
n
s
i
t
y
)
[Note: density
=
1
g
m
/
c
m
3
]
Molality
=
20
40
×
1000
500
×
1
=
1
m
Suggest Corrections
1
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