Homework Help: Chemistry

Posted by . on Tuesday, January 26, 2010 at 9:34am.

An aqueous solution contains 2.0 % NaCl by mass.

(1) Calculate the molality (NOT molarity!) of the solution.
(2) Calculate the mole fraction of the solution.

I know how to solve both but the problem is missing one other compound/element.

I know that molality is moles per kg of the solvent but I don't know what the solvent is. Is it water? Then how many kg of water?

As for the mole fraction, I know that number of moles of NaCl divided by the total number of moles but where will I get that other mole? Is it water again? How many will I use?

Thanks!

Chemistry - bobpursley, Tuesday, January 26, 2010 at 9:35am
exactly what does "aqueous" mean?
Chemistry - ., Tuesday, January 26, 2010 at 12:38pm
So how many grams and moles of water will I use? I know water is missing compound and for the molality calculation, how many will I use? 1 gram and then covert that to kg?

How many moles will I use? One mole?
Chemistry - ., Tuesday, January 26, 2010 at 12:55pm
Nevermind, I got it. It was simply 100g minus 2g of NaCl (mass of the solvent, water).

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