(a) The mole fraction of water in a mixture containing equal number of

1.	(a) The mole fraction of water in a mixture containing equal number of moles of water and ethanol is (i) 1 (ii) 0.5 (iii) 2 (iv) 0.25(b) The following are the vapour pressure curves of a pure solvent and a solution of a non-volatile solute in it.Based on the above curves answer the following questions: (i) What do the curves A and B indicate? (ii) Explain why the value of TB is greater than that of Tb0.
Answer» (a) (ii) 0.5 (b) (i) A-Vapour pressure curve of solvent Vapour pressure curve of solution (ii) Due to the presence of a non-volatile solute vapour pressure of solution is less than solvent and the boiling point is increased.

(a) The mole fraction of water in a mixture containing equal number of moles of water and ethanol is (i) 1 (ii) 0.5 (iii) 2 (iv) 0.25(b) The following are the vapour pressure curves of a pure solvent and a solution of a non-volatile solute in it.Based on the above curves answer the following questions: (i) What do the curves A and B indicate? (ii) Explain why the value of TB is greater than that of Tb0.

Answer»

(a)

(ii) 0.5

(b)

(i) A-Vapour pressure curve of solvent Vapour pressure curve of solution

(ii) Due to the presence of a non-volatile solute vapour pressure of solution is less than solvent and the boiling point is increased.

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