example: If 38.0 grams of sodium chloride is dissolved in 880.
grams of water, what is the molality of the solution?
must first convert grams to moles by dividing the compound's molar mass.
(38.0 grams sodium chloride) / (58.5 grams/mole) = 0.650 moles sodium
Next convert grams of solvent to kilograms of solvent.
880. / 1000. = 0.880 kilograms
Now, plug it in the formula and solve.
Molality = 0.650 moles / 0.880 liter = 0.739 Molal