why does the declinatıon from raoults law

Raul's Law and Dalton's Law are both related to the behavior of gases. Raoult's Law states that the vapor pressure of a component in a solution is directly proportional to its mole fraction. Meanwhile, Dalton's Law states that the total pressure exerted by a mixture of non-reacting gases is equal to the sum of the partial pressures of each individual gas. In other words, Raoult's Law applies to solutions, while Dalton's Law applies to gas mixtures.

Raoult's Law

the solutions's concentration

ideal solution are those which obey raoult's law at all conceutrations and temperatures