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Raoult’s Law

Jul 25, 2022, 16:45 IST

About Raoult’s Law

This law is applied for a solution of liquid in liquids and can be stated as follows.“The partial vapour pressure of any component in the solution is directly proportional to its mole fraction”.

PA XA Where, PA  =  Partial vapour pressure of A

PA = KXA

XA =Mole fraction of A in solution

For pure liquids XA = 1

Then K =   Where   is the vapour pressure of component A in pure state

Hence, PA  =   XA

Similarly for component B , PB =   XB

Raoult’s Law in Combination with Dalton’s Law of Partial Pressure: Assuming that vapours of a liquid is behaving like an ideal gas, then according to Dalton’s law of partial pressure the total pressure PT is given byPT = PA + PB

Detail explanation of Raoult’s Law

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