Homework Help: Chem9

Posted by Ryan on Monday, May 2, 2011 at 11:43pm.

An aqueous solution containing 35.1 grams of an unknown molecular (noneolectrolyte) compound in 152.5 grams of water was found to have a freezing point of -1.8 degrees C. Calculate the molar mass of the unknown compound.

Chem9 - DrBob222, Monday, May 2, 2011 at 11:51pm
delta T = Kf*molality
Solve for molality

molality = moles/kg solvent
Solve for moles

moles = grams/molar mass
solve for molar mass.

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