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161. Benzoic acid completely demerises in benzene. What will be the vapour pressure of solution containing 61 g of benzoic acid per 500 g benzene when the vapour pressure of pure benzene at the temperature of experiment is 66.6 torr?

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Short Answer Type

162.

Which of the following solution has the lowest freezing point and why? 0.1m glucose.01 m KCl, 0.1 m Na₂SO₄.

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Long Answer Type

163. Derive a relationship between mole fraction and vapour pressure of a compound of an ideal solution in the liquid phase and vapour phase.

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Fill In the Blanks

164. 100 g of a 10% solution of NaOH contains 10 g of NaOH in ______g of water.

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165. 3 g of a salt of molecular mass 30 is dissolved in 250 g water. The molality of the solution is __________.

0.4m

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166. The sum of the mole fractions of solute and solvent is ________.

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167. Any solvent in the _______ state would behave ideally.

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168. When an azeotropic mixture is distilled, its volume remains ________.

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169. For a non ideal solution exhibiting negative deviations from Raoult’s law, ΔH_mix has a________non-zero value.

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170. The limiting value of the Van’t Hoff factor for Na₂SO₄.10H₂O is________.

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