Question

Calculate the vapour pressure of the solution. When the mole fraction of the

solute is 0.5, the vapour pressure of the pure solvent is 0.6 atm.

Answer 1

In solution containing several non-volatile solutes, the lowering of the vapour pressure depends on the sum of the mole fraction of different solutes.This translates to the equation p0−pp0p0−pp0=x2=x2, the expression on the left hand side is called the relative lowering of vapour pressure and is equal to the mole fraction of the solute.0.80−0.400.800.80−0.400.80=x2=0.5