Lowering of vapour pressure is determined by Ostward and Walner dynamic method. It is based on the principle, when air is allowed to pass through a solvent or solution, it takes up solvent vapour with it to get itself saturated with vapours at that temperature. dry ari to solution overset(P_(A)) to underset(A)("solvent") overset(P_(A)^(+)) to "Anhy".CaCl_(2) to air. A and B are weighted separately before and after passing dry air. Loss in weight of each set, gives the lowering of vapour pressure. The temperature of air, the solution and the solvent is kept constant. Dry air was passed through 5 g of solute iini 80 g of water and then through pure water. The loss in weight of solution was 2.5 g and that of pure water was 0.04 g. The molecule weight of solute is:

Lowering of vapour pressure is determined by Ostward and Walner dynami

1.	Lowering of vapour pressure is determined by Ostward and Walner dynamic method. It is based on the principle, when air is allowed to pass through a solvent or solution, it takes up solvent vapour with it to get itself saturated with vapours at that temperature. dry ari to solution overset(P_(A)) to underset(A)("solvent") overset(P_(A)^(+)) to "Anhy".CaCl_(2) to air. A and B are weighted separately before and after passing dry air. Loss in weight of each set, gives the lowering of vapour pressure. The temperature of air, the solution and the solvent is kept constant. Dry air was passed through 5 g of solute iini 80 g of water and then through pure water. The loss in weight of solution was 2.5 g and that of pure water was 0.04 g. The molecule weight of solute is:
Answer» 7.143 71.43 74.3 `714.3 G "MOL"^(-1)` ANSWER :B