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Mass of solute needed for a given osmotic pressure

The same question, asked 2 times: 3 May 2023 S2*, 20 Apr 2026 S1. Every wording below, oldest first.

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  1. Question 1

    3 May 2023 S2

    61
    What mass of solute (molar mass 58 g mol−158\text{ g mol}^{-1}) is to be dissolved in 2.5 dm3 H2O2.5\text{ dm}^3\, \text{H}_2\text{O} to generate osmotic pressure of 0.245 atm at 300 K? [R=0.0821 dm3 atm K−1 mol−1][R=0.0821\text{ dm}^3\text{ atm K}^{-1}\text{ mol}^{-1}]

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  2. Question 2

    20 Apr 2026 S1

    24
    Calculate the mass of nonvolatile solute dissolved in 0.3 dm30.3\ \mathrm{dm^3} water having osmotic pressure 0.10.1 atm at 300300K. [Molar mass of solute = 328 g mol−1328\ \mathrm{g\,mol^{-1}}, R = 0.082 dm3atm K−1mol−10.082\ \mathrm{dm^3atm\,K^{-1}mol^{-1}}]

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