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(i) What would be the vapour pressure of...

(i) What would be the vapour pressure of a 0.5 molal solution of a non volatile solute in benzene at `30^(@)C` . The vapour prssure of pure benzene at `30^(@)C` is 119.6 torr.
(ii) 4 g of non-volatile solute were dissolved in 250g of water. The depression in freezing point to be 0.87 K. Calculate the molaar mass of the slute .. For watr `K_(f)=1.856K` kg/mol.
(iii) 0.50g of non-voltalie organic subtance was dissolved in 100 ml of carbon tetrachloride at `30^(@)C`. The vapour pressure of the solution was found to be 171.9. torr. Calculate the molal mass of the substane. Vapour pressure of `C Cl_(4) "at" 30^(@)C` is 143.0 torr and its density is `1.58` g.ml.

Text Solution

Verified by Experts

`114.94` torr
(ii) `341.3`
(iii) `M=63.3`
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