Calculate the mass percent of a solution prepared by dissolving 34.1 grams of potassium chloride in 150 grams of water. All right, so we're going to say here that our mass percent equals the grams of solute. Remember, the solute is the one that's smaller in amount. In this case it would be the 34.1 grams of potassium chloride divided by grams of solution.

Remember, your solution is your solute and your solvent added together. So KCl is our solute plus water, which is our solvent and that would be times 100. When you plug this in, you'll get back as your mass percent 18.5%. So this would represent the mass percent of our given solute shape.