It only holds for dilute solutions, although some mixtures of liquids obey it over a whole range of concentrations and are called perfect solutions, which occur when the intermolecular forces of the pure substances are similar to the forces between molecules of one and the other.  
It only holds for dilute solutions, although some mixtures of liquids obey it over a whole range of concentrations and are called perfect solutions, which occur when the intermolecular forces of the pure substances are similar to the forces between molecules of one and the other.  A solution that obeys this law is said to be an ideal solution.  Deviations in this law result in azeotropes.  First proposed by a French chemist, FTP, identify this law of chemistry which relates the vapor pressure of a solvent with its mole fraction.
It only holds for dilute solutions, although some mixtures of liquids obey it over a whole range of concentrations and are called perfect solutions, which occur when the intermolecular forces of the pure substances are similar to the forces between molecules of one and the other.  
Raoult's law