Vapour pressure of liquid-liquid Solution

Raoult's law
It states that for a solution of volatile liquid the partial pressure of each component of the Solution is directly proportional to its mole fraction present in Solution.
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Raoult's law as special case of Henry law
Lowering vapour pressure ( LVP)
The difference in the vapour pressure of pure solvent and Solution having non-volatile Solution. This is called lowering vapour pressure.
Relative lowering vapour pressure ( RLVP)
It is the ratio of lowering vapour pressure to vapour pressure of pure solvent.

Raoult's law in terms of relative lowering vapour pressure
It states that the relative lowering vapour pressure of the solution containing non-volatile solute is equal to the mole fraction of solute.

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