| % concentration by weight = mass solute / mass total x 100%
the solute is the thing dissolved = potassium nitrate
the solvent is the thing that does the dissolving = water
total mass = sum of all components
so mass solute = mass potassium nitrate = 18.0 g
mass total = 18.0 g + 150 g = 168.0 g
so % by weight = 18.0 g / 168.0 g x 100% = 10.7% |