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Monday, November 15, 2021

Liquid A and B forms an ideal solution and initial vapour pressure of A and B are P°A= 0.4 atm and P°A= 0.6 atm respectively. In a cylinder piston arrangement, 2 mole vapour of A and 3 mole vapour of B is collected at 0.42 atm.

(1) predict wheather the vapour will condense or not ?
(2) If the vapours are  compared slowly and isothermally at what  pressure F drop of liquid will form?
(3) If initial volume of vapour was 10 litre , at what volume first drop of liquid is form?
(4) What is the composition of first drop of liquid formed?
(5) If vapour pressure are further compressed. At what  pressure  almost complete condensation of vapour will occure?
(6) Determine the composition of last traces of vapours remains?
(7) What is the composition of system at 0.55 atm pressure?
(8) Determine the composition of liquid and vapour formed  at 0.51 atm also  calculate the moles of liquid of A and B in liquid and vapour formed ?
(9) At what pressure half of the total amount of vapour will condense?

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Sunday, November 14, 2021

Vapour pressure of a solution containing 6 gm of non volatile solute in 180 gm of water is 20 torr/mmHg. If 1 mole of water is further added in to the V.P. increases by 0.02 torr. calculate the V.P. of pure water and molecular wt of the non volatile solute.

10 gm of a solute is dissolved in 80 gm of acetone V.P. of solution is 271 mm Hg. If V.P. of pure acetone is 283 mm of Hg. calculate molar mass of solute.

calculate weight of urea which must be dissolved in 400 gm of water so that final has V.P. 2% than V.P. of pure water?

What is relation between relative lowering of vapour pressure and molality of solution?

ILLUSTRATION



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