Molar mass
Molar Mass
Molar mass is a physical property of substances. It is defined as the mass of a given substance (chemical element or chemical compound) divided by the amount of substance. The base SI unit for molar mass is kg/mol. However, for historical reasons, molar masses are almost always expressed in g/mol.
Pronunciation
Molar mass is pronounced as /ˈmoʊ.lər mæs/.
Etymology
The term "molar mass" is derived from the Latin word "molaris", which means "mill-like" or "pertaining to a mill", and the English word "mass", which is derived from the Old French "masse", meaning "lump" or "heap".
Related Terms
- Mole (unit): The mole is the base unit of amount of substance in the International System of Units (SI). It is used to express the amount of a chemical substance.
- Atomic mass: Atomic mass is the mass of an atom, most often expressed in unified atomic mass units.
- Molecular mass: Molecular mass or molecular weight is the mass of a molecule. It is calculated as the sum of the atomic masses of each constituent atom multiplied by the number of such atoms in the molecule.
- Molar mass constant: The molar mass constant, usually denoted by Mu, is a physical constant defined as the ratio of the molar mass of an entity to its relative mass. It is equal to one gram per mole.
Calculation
The molar mass of a substance is calculated by summing the molar masses of all the atoms in its chemical formula. The molar mass of an element is numerically equal to the element's relative atomic mass in g/mol.
Applications
Molar mass is used in stoichiometry calculations in chemistry. It is also used to convert between the mass of a substance and the amount of a substance.
External links
- Medical encyclopedia article on Molar mass
- Wikipedia's article - Molar mass
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