chemistry

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10.0 g sample of p-dichlorobenzene, a component of mothballs, is
dissolved in 80.0 g of benzene, C6H6. The freezing-point of the solution is
1.20oC. The freezing point of benzene is 5.48oC. The molal freezing –point
constant, kf, for benzene is 5.12oC/m. Calculate the apparent molar
mass of p-dichlorobenzene.

  • chemistry -

    delta T = i*Kf*m
    You know delta T, i = 1 and you know Kf. Solve for m, molality.
    Then m = moles/kg solvent.
    You know m and kg solvent, solve for moles.
    Then moles = grams/molar mass. You know moles and grams, solve for molar mass.
    Post your work if you get stuck.

  • chemistry -

    k thanks

    Its a practice question for my final exam. No answer is given.

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