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March 27, 2017

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A solution is prepared with an unknown compound with an empirical formula of C3H7NO.
The solution is made by dissolving 30.0 mg of compound in 1.200 g of the organic solvent biphenyl. The freezing point was depressed by 1.37C. What are the molar mass and molecular formula of the compound?

  • chemistry - ,

    delta T = Kf*molality
    Solve for molality.

    molality = moles/kg solvent
    Solve for moles

    moles = grams/molar mass
    Solve for molar mass.

    molar mass/empirical mass and round to the nearest whole number = n
    molecular formula is (empirical formula)n

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