Friday
February 27, 2015

Homework Help: Physical Chemistry

Posted by Trixie on Monday, February 15, 2010 at 1:45pm.

Calculate the concentrations of each of the following solutions.
(a) the molality of chloride ions in an aqueous solution of iron(III) chloride for which xFeCl3 is 0.0195

(b) the molality of hydroxide ions in a solution prepared from 9.16 g of barium hydroxide dissolved in 179 g of water

(c) the molality of 12.70 M NH3(aq) with a density of 0.9519 gcm-3

I have repeatedly tried to figure out how to solve these, but I am getting something wrong. I know molality is mol solute/kg solvent. I'm especially having trouble with the second question. Please don't just give me the answer--try to explain how you solved it. An answer would be helpful so I can compare what I come up with though. Thanks!!

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