Question

How is relative lowering of vapour pressure measured?

Answer 1

Relative lowering of vapour pressure is measured using the formula 

`(p^0 - p)/p^0 = chi_"solute"`

Where:

P⁰ = Vapour pressure of the pure solvent

P = Vapour pressure of the solution

`chi_"solute"`​ = Mole fraction of the solute