Calculate the percent by mass of potassium nitrate in a solution made from 45.0 g kno3 and 295 ml of water. The density of water is 0.997 g/ml.

Answer: the percent by mass of potassium nitrate is 13.3%

Explanation:

1) dа ta:

Mass of solute, m₁ = 45.0 g Volume of solvent, V₂ = 295 ml density of water, d₂ = 0.997 g/ml

2) Formulae:

Percent by mass, % = (mass of solute / mass of solution) * 100

Density, d = mass / volume

3) Solution:

d = mass / volume ⇒ m₂ = d₂ * V₂ = 0.997 g/ml * 295 ml = 294. g mass of solution = m₁ + m₂ = 45.0g + 294. g = 339. g % = (45.0 g / 339. g) * 100 = 13.3 % The answer has to be reported with 3 significant figures.