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Relative lowering of vapour pressure from the vapour pressures of solvent and solution

The same question, asked 2 times: 16 May 2023 S2*, 14 May 2024 S1. Every wording below, oldest first.

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  1. Question 1

    16 May 2023 S2

    71
    Calculate the relative lowering of vapour pressure if vapour pressure of pure solvent and vapour pressure of solution at 25∘C25^\circ\text{C} are 32 and 30 mm Hg respectively.

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  2. Question 2

    14 May 2024 S1

    96
    Calculate the relative lowering of vapour pressure if the vapour pressure of benzene and vapour pressure of solution of non volatile solute in benzene are 640 mm Hg and 590 mm Hg respectively at same temperature.

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