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Adding 1.00 g of benzene, C6H6, to 80 g of cyclohexane, C6H12, lowers the freezing point of the cyclohexane from 6.5 to 3.3 degree celsius. What is the value of kf for cyclohexane?

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delta T = Kf*molality
mols benzene = grams/molar mass = ?
molality = mols benzene/kg cyclohexane
You know m and delta T, solve for Kf.

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