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Vapour pressure of a solution of a nonvolatile solute from its composition

This type of question, asked 7 times: 2 May 2023 S1, 15 May 2023 S2, 11 May 2024 S1, 25 Apr 2025 S2, 11 Apr 2026 S1, 13 Apr 2026 S2, 15 May 2026 S1. All 7 questions 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

    15 May 2023 S2

    85
    What is the vapour pressure of a solution containing 0.1 mol of non-volatile solute dissolved in 16.2 g water? (P10=24 mmHgP_1^0 = 24\text{ mmHg}, molar mass of water 18 g mol−118\text{ g mol}^{-1})

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  3. Question 3

    11 May 2024 S1

    58
    What is vapour pressure of a solution containing 1 mol of a non-volatile solute in 36 g of water (P10=32(P_1^0 = 32 mmHg)?

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  4. Question 4

    25 Apr 2025 S2

    57
    Calculate the vapour pressure of solution if relative lowering of vapour pressure and vapour pressure of pure solvent are 0.018- and 18-mm Hg respectively at 300 K .

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  5. Question 5

    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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  6. Question 6

    13 Apr 2026 S2

    22
    A solution is prepared by dissolving 6868 g sucrose in 11 kg water. Calculate the vapour pressure of solution at 298298 K. [vapour pressure of water at 298298 K = 1818 mm of Hg & mole fraction of solvent = 0.99640.9964]

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  7. Question 7

    15 May 2026 S1

    21
    A solution is prepared by dissolving 136.8136.8 g sucrose in 11 kg of water. Find the vapor pressure of solution at 298298 K. [Molar mass of sucrose = 342 g mol−1342\ \mathrm{g\ mol^{-1}}, Vapour pressure of water = 1818 mm Hg]

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