Homework Help: chemistry

Posted by paul on Monday, November 26, 2012 at 10:35pm.

A solution which contains 40.3 g of an unknown molecular compound in 360 g of water freezes at -5.07°C.
What is the molar mass of the unknown?

chemistry - DrBob222, Monday, November 26, 2012 at 11:01pm
delta T = Kf*m
Substitute and solve for molality.

molality = mols/kg solvent.
Substitute and solve for mols.

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

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