What happens to the vapour pressure of a liquid when a non-volatile solute is added to it

Why is the vapour pressure of a solvent lowered on the addition of non-volatile solute into it ?

The vapour pressure of water is 12.3 kPa at 300 K. Calculate vapour pressure of 1 molal solution of a non-volatile solute in it.

The vapour pressure of a liquid in a closed container depends upon

When non-volatile solute is added to a pure solvent, the:

The vapour pressure of a give liquid will decrease if :

The vapour pressure of the solvent decreased by 10 mm of Hg when a non volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the fraction of the solvent if a decrease in vapour pressure of 20 mm of Hg is desired:

Lowering of vapour pressure on dissolving a non-volatile solute in a liquid is a colligative property.

How will you calculate the molecular mass of a solute with the help of relative lowering in vapour pressure of a solution of a non volatile solute?