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15 September, 08:49

Adding a nonvolatile solute to a solution decreases the vapor pressure of the solution. True or False

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  1. 15 September, 11:36
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    True.

    Explanation:

    Adding a non - volatile solute to solvent, decreases the tendency for water molecules to evaporate into gas phase i. e these non - volatile solute particles obstruct or reduce the rate of evaporation. Few water molecules in the vapour.

    Therefore, Adding a nonvolatile solute to a solution decreases the vapor pressure of the solution while

    Vapor pressure is a measurement of the likelihood of the molecules of a pure solvent to change from the liquid to the vapor phase.

    Using Raoult's Law:

    Psol = Xsolv * P°solv

    where:

    Psol = the vapor pressure of the solvent above the solution,

    Xsolv = the mole fraction of the solvent in the solution, and

    P°solv = the vapor pressure of the pure solvent.
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