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Thyroxine, an important hormone that controls the rate of metabolism in the body can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution could be measured as 5.144°C. Pure benzene freezes at 5.444°C and has a value for the molal freezing-point-depression constant of Kf of 5.12°C/m. What is the approximate molar mass of thyroxine?

  • Chemistry -

    delta T = Kf*molality
    Solve for m

    m = mols/kg solvent.
    Substitute and solve for mols.

    mols = grams/molar mass
    Substitute and solve for molar mass.

  • Chemistry -


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