Homework Help: chemistry

Posted by Helen on Wednesday, November 14, 2012 at 9:15pm.

2. When 0.354 g of an unknown nonelectrolyte compound was dissolved in 12.5 g of benzene a solution was formed that froze at 4.46°C.
(a) Calculate the molar mass of the unknown compound. The freezing point of benzene is 5.48°C, and the Kf of benzene is 5.12 °C/Molal. Show your work

chemistry - DrBob222, Wednesday, November 14, 2012 at 9:26pm
delta T = kf*m
Substitute and solve for m

m = mols/kg solvent
Substitute and solve for m

mols = grams/molar mass. You know mols and grams, solve for molar mas.

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