100 g of potassium chloride was dissolved in 400 g of H2O. Determine the mass fraction of potassium chloride in the solution.
Solution mass = solvent mass + solute mass = 400 g + 100 g + 500 g.
Mass fraction of dissolved substances = mass of dissolved substances / mass of solution = 100 g / 500 g = 0.2 = 20%.
Answer: mass fraction of sodium chloride = 20%.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.