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Posted by on Sunday, December 5, 2010 at 5:15pm.

If you wanted to have a solution of benzene that would freeze at 0 degrees Celsius with NaCl, what would be the mole fraction of NaCl that you would need?

  • chemistry - , Sunday, December 5, 2010 at 5:59pm

    What's the freezing point of benzene?
    delta T = i*Kf*molality
    i = 2 for NaCl.
    Kf = ?? for benzene.
    solve for molality.

    Then molality = moles/kg solvent.
    Convert 1 kg solvent (benzene) to moles. moles = grams/molar mass.
    Finally, mole fraction NaCl = moles NaCl/(moles NaCl + moles benzene)
    Post your work if you get stuck.

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