Raoult's law

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Simply put, Raoult's law states that the vapour pressure, of a binary solution, containing a non-volatile solute, is directly related to the mole fraction of solvent (i.e. volatile) in the solution.

Also, it states that the vapour pressure of each component in a binary solution containing volatile components is directly related to its respective mole fraction in the solution.

Relative going-down of vapour pressure is equal to mole fraction of non volatile and non-electrolytic solute. This is known as Raoult's law.