Homework Help: chemistry

Posted by Jim_R on Thursday, August 6, 2009 at 12:24pm.

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 - DrBob222, Thursday, August 6, 2009 at 3:52pm
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 - Jim_R, Friday, August 7, 2009 at 1:25am
k thanks

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

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