Homework Help: Chem

Posted by Ginger on Friday, April 25, 2008 at 10:47pm.

A solution of lithium chloride in water has a mole fraction of 0.0500 in LiCl. What is the molality?

Mole fraction = moles of LiCl over total moles of solution

Molality=moles of LiCl per kg of solvent

How do I link this information?

Chem - DrBob222, Saturday, April 26, 2008 at 12:14am
Assume you have 1.00 mol solution.
That means you have 0.05 mols LiCl and 0.95 mols H2O.
0.95 mol H2O x (18.015 g H2O/1 mol H2O) = 17.11 grams H2O.
So molality = mols/kg solvent=
0.05 mols LiCl/0.01711 kg solvent = xx molal.

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