**A solution's mass-mass percent concentration is given as the mass of the solute divided by the mass of the solution, which is then multiplied by 100 percent.** The mass of the solution is equal to the mass of the solvent added to the mass of the solute.

For example, if given a solution that contains 5.0 grams of a solute and 110.0 grams of solvent, then the mass-mass percent concentration of the solute is 5.0 grams/(5.0 +110.0) x 100 percent, which is equal to 4.35 percent.

The mass-mass percent composition formula is only one of many methods used to express the mass percentages of solutes and solvents that make up a solution. Some others are molarity mole fraction and molality. However, these other formulas involve using other known quantities like moles and volume.