Which of the following is correct ?
(a) Mole fraction of I + mole fraction of II = 1 (if
only two components are present)
(b)
Mole fraction of I Mole of I
Mole fraction of II Mole of II
(if only two
components are present)
(b)Mole fraction of solute =
mole of solute
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Expressing Concentration of Solutions
Which of the following stat...
CHEMISTRY
Which of the following statements are correct?
(i) Mole fraction of a solute + mole fraction of solvent = 1
(ii) If equal weights of helium and methane are present in a gaseous mixture, then the mole fraction of He is
5
4
.
(iii) The mole fraction of water in the aqueous solution of NaOH is 0.8. The molality of the solution is nearly 14 moles Kg
−1
.
December 30, 2019
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Keerthana Hasan
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ANSWER
(i) X
A
=
n
A
+n
B
n
A
, X
B
=
n
A
+n
B
n
B
Hence, X
A
+X
B
=1
(ii) X
He
=
4
X
+
16
X
4
X
=0.80=
5
4
.
(iii)
(X
solv
)m
solv
1−X
solv
=m
m=
1000
0.8×18
1−0.8
=13.8 mole kg
−1
≈14 m
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