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What does the vapor pressure of solvent containing a non-volatile solute, in a closed system directly vary with?

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in Chemistry – Class 12 by (188k points)
What does the vapor pressure of solvent containing a non-volatile solute, in a closed system directly vary with?

(a) Mole fraction of solute

(b) Mole fraction of solvent

(c) Molarity of solute

(d) Molarity of solvent

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Enquiry is from Vapour Pressure of Liquid Solutions topic in portion Solutions of Chemistry – Class 12

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Correct option is (b) Mole fraction of solvent

Easiest explanation: More the solute, lower is the vapor pressure of the solvent when compared to that when it is in its purest form. In case of greater amount of non-volatile solute, more solvent can be added to raise the vapor pressure. Therefore, it is always directly proportional to the mole fraction of the solvent.

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