An aqueous solution is 36% by mass silver nitrate, AgNO3, and has a density of 1.41 g/mL. What is the molality of silver nitrate in the solution?

Molality = 3.31 mol/kg

Explanation:

Molality is a property of a solution that measures the concentration of its solution.

By definition, molality is the number of moles of solute per kilogram of solvent. The unit for molality is mol/kg.

36.0% AgNO3 by mass = 36.0 grams AgNO3 per 100 g solution which is equivalent to 360 g/1000g solution.

Molar mass of AgNO3 = 108 + 14 + (16*3)

= 170 g/mol

Number of moles of AgNO3 = mass/molar mass

= 360/170

= 2.118 moles

A 1000 g solution is made of (360 g AgNO3 + 640 g water).

Mass of water = 640 g

g to kg = 0.64 kg

molality = moles/kg solvent.

= 2.118/0.640

= 3.31 mol/kg