Which quantity is represented by the relative lowering in vapour pressure?
Answer & explanation
Correct answer: option 1
In a solution containing non volatile solute, the lowering of the vapour pressure depends on the mole fraction of solute.
\(\frac{P0-P}{P0}\) = XB
where P0 is vapour pressure of pure solvent
P is vapour pressure of solution and
xB is mole fraction of solute.