tömegszázalékként

Tömegszázalékként, often translated as "mass percentage," is a unit of concentration commonly used in chemistry. It represents the mass of a solute divided by the total mass of the solution, multiplied by 100. The formula for calculating mass percentage is:

Mass Percentage = (Mass of Solute / Mass of Solution) * 100%

The mass of the solution is the sum of the mass of the solute and the mass of the solvent. This unit is particularly useful when dealing with solid solutions or when the density of the solution is not readily available or may vary with temperature. For example, if you dissolve 10 grams of salt in 90 grams of water, the mass of the solution is 100 grams. The mass percentage of salt in this solution would be (10 g / 100 g) * 100% = 10%.

Mass percentage is a dimensionless quantity, but it is often expressed with the unit "% w/w" (weight by weight) or "% m/m" (mass by mass) to clarify that it refers to the ratio of masses. It is important to distinguish mass percentage from other concentration units such as molarity or molality, which involve moles. Understanding mass percentage is crucial for stoichiometric calculations, solution preparation, and interpreting analytical data in various scientific and industrial applications.