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  4. Relative lowering of vapor pressure of a dilute solution is 0.5. What is the mole fraction of the non-volatile solute?

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Q. Relative lowering of vapor pressure of a dilute solution is $0.5$. What is the mole fraction of the non-volatile solute?

TS EAMCET 2020

Solution:

Relative lowering of vapour pressure of a non-volatile solute is expressed as:
$RLVP =\frac{\Delta p}{p^{\circ}}=x_{B}=0.5$ (given)
where, $\chi_{B}=$ mole fraction of the solute $=0.5$