Concentration is a term used to express the amount of solute present in a solution or in a solvent.

Mass percentage is one of the concentration terms. Mass percentage of a component in a solution is equal to the mass of the component (solute) present per mass of the solution.

$\text{ Mass by mass percentage }=\frac{\text{ Mass of solute }}{\text{ Mass of solution }}\times 100$

The ratio of mass of solute and mass of solution is called mass fraction.