Relative lowering of vapour pressure Formula
Vapour pressure :
The pressure exerted by gaseous state of a substance when it is in Equilibrium with solution phase.
Lowering of vapour pressure:
The difference between vapour pressure of pure solvent and vapour pressure of solution is known as lowering vapour pressure.
P° = vapour pressure of pure solvent.
P= vapour pressure of solution
Relative lowering of vapour pressure:
Relative lowering of vapour pressure is when we have volatile solvent and add non volatile solute in it then vapour pressure is decrease.
Formula:
P₁° = Vapour pressure of pure solvent
P₁= Vapour pressure of solution
X₂ = Mole fraction of non volatile solute
n₁ =number of moles of solvent
n₂= number of moles of solute
w₁= mass of solute
w₂= mass of solvent
M₁= molar mass of solute
M₂= molar mass of solvent