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AP Chem. 3

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A 1.80 g sample of a large boimolecule was dissolved in 21.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolecule. For carbon tetrachloride, the boiling point constant is 5.03°C·kg/mol, and the boiling point of pure carbon tetrachloride is 76.50°C.

  • AP Chem. 3 -

    delta T = kb*molality
    You know delta T and Kb.
    Solve for m

    molality = moles unknown/kg solvent
    Solve for moles unknown.

    moles = grams/molar mass
    You have moles unknown and grams unknown,
    solve for molar mass of unknown.

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