Paragraph on vapor pressure

Lowering of vapor pressure is determined by this process
In the following process,Air is allowed to pass through a solvent or solution;it takes up solvent vapor with it ot get itself saturated with vapors at that temperature

Air(Dry)\rightarrow Solution(A)\rightarrow Solvent(A)\rightarrow CaCl_2(Anhydrous)\rightarrow Air
P_A P_A°

A and B are weighed separately before and after passing dry air.Loss of weight of each set gives lowering of vapor pressure.The temperature of air ,the solution and the solvent is kept constant

Q1 Loss of weight w₁ of solution is proportional to ?
Q2 Loss of weight of solvent w₂ is proportional to ?
Q3 Gain in weight of anhydrous CaCl₂ is proportional to ?
Q4 \frac{P_A^o-P_A}{P_A^o}= ?
Q5 Dry gas is passed through 5g of solute in 80g of water and then through pure water.The loss in weight of solution was 2.5g and that of pure water was 0.04g .Find the molecular weight of solute