Answer:
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
