Answer :

(a) (i) Molarity is defined as number of moles of solute dissolved in one litre of solution.



(ii) It is also known as Ebullioscopic constant. It is equal to the elevation in boiling point of 1 molal solution.


As Tb = Kb × m


At m=1, Tb = Kb


(b) For isotonic solutions:


π urea= π glucose



(As volume of solution is same)




OR


(a) It shows positive deviation.


It is due to weaker interaction between acetone and ethanol than ethanol-ethanol interactions.


(b) Given:


Molarity:




Molality:




=0.61 m


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