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October 2, 2014

Homework Help: chemistry

Posted by molality--->molarity on Sunday, July 10, 2011 at 6:17pm.

what is the Molarity (M) of a 0.87m aqueous solution of ammonia, NH3?
The density of the solution is 0.823 g/mL.

Answer: 0.71 M

So I have:

0.823 g H2O+NH3/1 ml H2O+NH3
17.034 g NH3/1 mol
18.016 g H2O/1 mol
0.87 mol NH3/1 kg H2O

I've tried this several ways and I can't seem to separate to moles of NH3 from kg of H20 or isolate the number of Liters of H20.

I know (through calculations) that there are also 823 g NH3+H2O/L NH3+H2O
and 23.48 mol NH3+H2O/L NH3+H2O.

Any help on where to go would be appreciated.

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