# Calculating molality given density and molarity

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I haven't taken chemistry in over 3 years so I have forgotten a lot of the very basic concepts (even while understanding the higher level stuff) and am having problems with this simple thing! Please help :(.

Question 1- At 20°C, a 2.32 M aqueous solution of ammonium chloride has a density of 1.0344 g/mL What is the molality of ammonium chloride in the solution? The formula weight of NH4Cl is 53.5 g/mol.

I don't think I have to use temperature here. I know how to calculate molality when im given how many grams are in the solution but the way this one is worded im confused. Not looking for the answer, just a little help on where to start.

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$$\textrm{molality} = \frac{2.32 \ mol}{0.91028 \ kg \ water} = 2.549 \ m$$