The vapour pressure of an aqueous solution containing a non volatile solute at a hundred degree is 750 mm Hg. The mole fraction of the solute in the solution is ?
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1
Answer:
answer is 0.731
Explanation:
The expression for the relative lowering in the vapor pressure and the mole fraction of solute is
P
ΔP
=
N
n
For 1 L of solution
760
10
=
55.56
n
Thus, the number of moles of solute n=0.731
Thus, the mole fraction of solute =
55.56
0.731
=0.013
The molarity of the solution is
1
0.731
=0.731 m
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