Relative lowering of vapour pressure of a dilute solution is 0.2. What is the mole-fraction of the non-volatile solute?

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0.3

0.8

0.2

0.5

answer is D.

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Detailed Solution

according to Raoult’s law the relative lowering in vapour pressure of an ideal solution containg the non-volatile solute is equal to the molefraction of the solute.
$∴$ Relative lowering of vapour pressure =0.2.
$∴$ Molefraction of the solute=0.2.

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