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Molar mass of a protein or other solute from osmotic pressure

This type of question, asked 5 times: 28 Jun 2022, 31 Jan 2023, 10 Apr 2023, 13 Apr 2023, 5 Apr 2026 S2. All 5 questions below, oldest first.

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  1. Question 1

    28 Jun 2022

    143
    2.5 g2.5\text{ }g of protein containing only glycine (C2H5NO2)\left( C_{2}H_{5}NO_{2} \right) is dissolved in water to make 500 mL500\text{ }mL of solution. The osmotic pressure of this solution at 300 K300\text{ }K is found to be 5.03×10−35.03 \times10^{- 3} bar. The total number of glycine units present in the protein is (Given: R=0.083 LbarK−1 mol−1R = 0.083\text{ }LbarK^{- 1}{\text{ }mol}^{- 1} )

  2. Question 2

    31 Jan 2023

    60
    At 27∘C27^{\circ}C, a solution containing 2.5 g2.5\text{ }g of solute in 250.0 mL250.0\text{ }mL of solution exerts an osmotic pressure of 400 Pa400\text{ }Pa. The molar mass of the solute is ____ g mol−1g\text{ }mol^{- 1} (Nearest integer) (Given: R=0.083 LbarK−1 mol−1R = 0.083{\text{ }L}_{bar}K^{- 1}{\text{ }mol}^{- 1} )

  3. Question 3

    10 Apr 2023

    146
    An aqueous solution of volume 300 cm3300{\text{ }cm}^{3} contains 0.63 g0.63\text{ }g of protein. The osmotic pressure of the solution at 300 K300\text{ }K is 1.29 mbar. The molar mass of the protein is___ gmol−1gmol^{- 1} Given: R=0.083 LR = 0.083\text{ }L bar K  −1 mol−1\ ^{- 1}{\text{ }mol}^{- 1}

  4. Question 4

    13 Apr 2023

    52
    Solution of 12 g12\text{ }g of non - electrolyte (A) prepared by dissolving it in 1000 mL1000\text{ }mL of water exerts the same osmotic pressure as that of 0.05M0.05M glucose solution at the same temperature. The empirical formula of AA is CH2OCH_{2}O. The molecular mass of AA is _______g. (Nearest integer)

  5. Question 5

    5 Apr 2026 S2

    48
    20 g hemoglobin in a 1 L aqueous solution (A) at 300 K is separated from pure water by semi permeable membrane. At equilibrium the height of solution in a tube dipped in a solution (A) is found to be 80.0 mm higher than the tube dipped in water. The molar mass of hemoglobin is ____\_\_\_\_ kgmol−1kg{mol}^{- 1}.(Nearest integer) (Given : g=10 ms−2,R=8.3kPadm3 K−1 mol−1g = 10{\text{ }ms}^{- 2},R = 8.3kPa{dm}^{3}{\text{ }K}^{- 1}{\text{ }mol}^{- 1}, density of solution =1000 kg m−3= 1000\text{ }kg{\text{ }m}^{- 3} )