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Vapour pressure of a solution of a nonvolatile solute in benzene or CCl4

The same question, asked 2 times: 2 May 2023 S1*, 11 Apr 2026 S1. Every wording below, oldest first.

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  1. Question 1

    2 May 2023 S1

    97
    A solution of non-volatile solute is obtained by dissolving 2 g in 50 g benzene. Calculate the vapour pressure of solution if vapour pressure of pure benzene is 640 mmHg at 25∘25^\circC. [mol. mass of benzene =78= 78 g mol−1^{-1}, mol. mass of solute =64= 64 g mol−1^{-1}]

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  2. Question 2

    11 Apr 2026 S1

    20
    Vapour pressure of CCl4\mathrm{CCl_4} at 25∘C25^\circ\mathrm{C} is 143143 mm Hg. If 0.50.5 g of a non-volatile solute is dissolved in 100 cm3100\ \mathrm{cm^3} of CCl4\mathrm{CCl_4}. Find the vapour pressure of the solution. (Density of CCl4=1.58 g/cm3\mathrm{CCl_4} = 1.58\ \mathrm{g/cm^3} and molecular weight of solute is 6565)

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