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Calculate the freezing point of a solution of 20.0 g methyl salicylate, C7H6O2, dissolved in 800 g of benzene, C6H6. Kf for benzene is 5.10°C /m and the freezing point is 5.50°C for benzene.

A) -1.05°C
B) 1.05°C
C) 4.45°C
D) 6.54°C

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2 answers

  1. 4.45

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  2. moles = grams/molar mass.
    Solve for moles methyl salicylate.

    molality = moles/kg solvent
    Solve for molality

    delta T = Kf*m
    Solve for delta T

    freezing point = 5.50 - delta T.

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