Chemistry

6.00 g of hemoglobin was dissolved in 250.0 mL of solution. The resulting osmotic pressure was 6.80 mmHg at 23.0C. what is the molar mass of hemoglobin?

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  1. Convert 6.80 mm Hg to atmospheres. 6.80/760 = ? = pi (not 3.14 but pi in this case is osmotic pressure).
    pi = MRT
    pi from above.
    You know R and T (remember T must be in kelvin).
    Solve for M = molarity = mols/L
    You know M and L, solve for mols.
    Then mols = grams/molar mass. You know mols and grams, solve for molar mass.

    Post your work if you get stuck.

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  2. got it! thanks so much

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