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Calculate the molecular weight of a small protein if a 0.32 g sample dissolved in 161 mL of H2O has an osmotic pressure of 9.0 mmHg at 25 degree celcius. (R=0.0821 L X atm/K X mol)

  • CHM -

    pi = MRT
    Substitute and solve for M = molarity.
    Then M = mols/L. Substitute 0.161 for L and solve for mols.
    Then mols = n = grams/molar mass.
    You know n and grams, solve for molar mass. By the way, pi must be in atm. pi = 9.0 mm/760 = ?

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