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C_{7} H_{5} COOH mol . mass = 12 \times 6 + 5 \times 1 + 12 + 2 \times 16 + 1 = 122 g {mol}^{- 1} . C_{6} H_{5} COOH \to \frac{1}{2} (C_{6} H_{5} COO)_{2}

No. of moles after dissociation

1 - α α / 2

Total number of moles after association

= 1 - α + \frac{α}{2} = 1 - \frac{α}{2}

Mole fraction of benzoic acid

(n_{A}) = \frac{61}{122} = 0.5

Mole fraction of benzoic

(n_{B}) = \frac{500}{78} = 6.4 .

\frac{{p^{o}}_{A} - p_{A}}{{p^{o}}_{A}} = \frac{n_{A}}{n_{A} + n_{B}} \frac{66.6 - p_{A}}{66.6} = \frac{0.5}{0.5 + 6.4} = \frac{0.5}{6.9} = 0.072

66.6 - p_{A} = 66.6 \times 0.72 = 4.79

66.9 - 4.79 = p_{A}

∴

p_{A} = 61.8 torr

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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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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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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 __________.

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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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