massaprosenttina

Massaprosenttina, also known as mass percent or weight percent in English, is a way to express the concentration of a component in a mixture by its mass. It indicates what fraction of the total mass is contributed by a particular component, scaled by 100 to give a percentage.

Definition and formula

Mass percent (m%) is defined as m% = (mass of component / total mass of mixture) × 100%. The total mass includes all components in the mixture. The value is independent of volume and temperature, because it relies on mass measurements.

Calculation and example

To determine mass percent, weigh the component of interest and the entire mixture, then apply the formula. Example: a solution contains 25 g of solute and 200 g of solvent, for a total mass of 225 g. The mass percent of the solute is (25 / 225) × 100% ≈ 11.1%.

Context and usage

Mass percent is widely used in chemistry, pharmacy labeling, food and beverage products, and materials science. It provides a straightforward way to communicate composition when masses are readily measured. It is especially convenient when volume changes during mixing are unknown or irrelevant.

Relation to other concentration measures

Mass percent differs from mole percent or mole fraction, which express concentration in terms of moles rather than mass. It also differs from volume-based measures such as percent by volume. In practice, mass percent and weight percent are often used synonymously in laboratory settings, where mass measurement is the primary data source.

See also

Mass fraction, mole fraction, molarity, percent by volume.