Chemistry Homework Help With Immiscible Liquid

Immiscible Liquid

Let us consider the case of mixing of two volatile but immiscible liquids A and B. In the mixture of two liquids, if P0A and P0B are vapour pressures, of two liquids in pure state, then according to Dalton’s law, total vapour pressure is given by

PT = PA + PB

Where PA and PB are the partial vapour pressures of liquids A and B. If XA and XB are mole fractions of A and B in the mixture (actually they as immiscible) then

or similarly or

Vapour composition

It X’A and X’B denotes the mole fractions of A and B in vapour face, then.

Partial vapour pressure = Mole fraction x Total vapour pressure

PA = X’A ´ PT

or

similarly

Also

or where

or

= mass of A

= molecular mass of A

= mass of B

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