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Formula For Relative Lowering of Vapour Pressure

Chemistry Formulas

Relative Lowering of Vapour Pressure :

When a non-volatile solute (B) is dissolved in a liquid, the vapour pressure (PTotal) of the solution becomes lower than the vapour pressure of pure solvent.

From Raoult’s Law : Vapour pressure of the solution is given by :

PTotal = PA  (PA = partial vapour pressure of the solvent in solution) [PB = 0]

relative lowering of vapour pressure

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