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raoult's law

Raoult's law ( law) is a law of thermodynamics established by French chemist François-Marie Raoult in 1887. It states that the partial vapor pressure of each component of an ideal mixture of liquids is equal to the vapour pressure of the pure component multiplied by its mole fraction in the mixture. In consequence, the relative lowering of vapour pressure of a dilute solution of nonvolatile solute is equal to the mole fraction of solute in the solution. Mathematically, Raoult's law for a single component in an ideal solution is stated as p i = p i ⋆ x i , {\displaystyle p_{i}=p_{i}^{\star }x_{i},} where p i {\displaystyle p_{i}} is the partial pressure of the component i {\displaystyle i} in the gaseous mixture (above the solution), p i ⋆ {\displaystyle p_{i}^{\star }} is the vapor pressure of the pure component i {\displaystyle i} , and x i {\displaystyle x_{i}} is the mole fraction of the component i {\displaystyle i} in the mixture (in the solution).Once the components in the solution have reached equilibrium, the total vapor pressure of the solution can be determined by combining Raoult's law with Dalton's law of partial pressures to give p = p A ⋆ x A + p B ⋆ x B + ⋯ {\displaystyle p=p_{\text{A}}^{\star }x_{\text{A}}+p_{\text{B}}^{\star }x_{\text{B}}+\cdots } If a non-volatile solute (zero vapor pressure, does not evaporate) is dissolved into a solvent to form an ideal solution, the vapor pressure of the final solution will be lower than that of the solvent.

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