Using Raoult's law, show that ∆P = x₂ p° when P° is vapour pressure of a solvent and x₂ is the mole fraction of solute.
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Given:
Vapour pressure of solvent=
Mole fraction of solute=
To Find:
An equation for relation between the vapour pressure of solution (P) and the mole fraction of solution ().
Solution:
Considering is vapour pressure of solvent and P is vapour pressure of solution, and is mole fraction of solution while is mole fraction of solute,
According to Raoult's law, we get the equation:
=
=
1 - =
= 1 -
=
= X
The required equation is hence derived from Raoult's law.
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