At a particular temperature why is the vapour pressure of acetone less than that of ether?

At a particular temperature why vapour pressure of acetone is less than that of ether.

At a particular temperature vapour pressure of ethanol is more than that of water. Give reason.

Why the vapour pressure of saline solutions is lower than that of pure water ?

The vapour pressure of a solution cont.aning 10 g of a non-electrolyte in 200 g of water at a particular temperature is 2985 Pa. The vapour pressure of pure water at that temperature is 3000 Pa. Calculate the molecular mass of the solute.

The vapour pressure of solution containing 5 g of non-electrolyte in 90g of water at a particular temperature is 2985 Nm^(–2) . The vapour pressure of pure water at that temperature is 3000 Nm^(–2) . The molecular weight of the solute is –

The vapour pressure of a solution of 5g of non-electrolyte in 100g of water at a particular temperature is 2985 N m^(-2) . The vapour pressure of pure water at that temperature is 3000 N m^(-2) . The molecular weight of the solute is