Stoichiometry
In case of a ternery system involving two liquid components and a solute, the ratio of the concentration of the solute in the two phases at equilibrium is called the distribution co-efficient. The distribution co-efficient depends upon the

Temperature
Neither A nor B
Solute concentration
Both A & B

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Stoichiometry
According to Raoult's law, "The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component." Raoult's law is not applicable under the following assumption/condition.

In the formation of solution, chemical combination/molecular association between unlike molecules takes place
The component molecules are non polar and are of almost equal size
No component is concentrated at the surface of the solution
The attractive forces between like and unlike molecules are almost equal

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