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Mole unit - Definition | | Mole unit - Definition: Encyclopedia II - Mole unit - Definition | | A mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 12 grams of carbon 12, where the carbon 12 atoms are unbound, at rest and in their ground state. [1] The number of atoms in 12 grams (or, 0.012 kilograms) of carbon 12 is known as Avogadro's number. It is approximately 6.0221415×1023 (2002 CODATA value).
A mole is a dimensionless name for an integer, much like dozen or googol. Although the exact value of the mole is not known at present, it is equal to Avogadro's number, ...
See also:Mole unit, Mole unit - Definition, Mole unit - Elementary entities, Mole unit - History, Mole unit - Utility of moles, Mole unit - Example calculation | | | Mole unit, Mole unit - Definition, Mole unit - Elementary entities, Mole unit - Example calculation, Mole unit - History, Mole unit - Utility of moles, Avogadro's number, List of particles, Chemistry, Einstein (unit), Physics, Stoichiometry, Mole Day, Molarity, CODATA | | |
| | | Mole unit: Encyclopedia II - Mole unit - Definition
Mole unit - Definition
A mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 12 grams of carbon 12, where the carbon 12 atoms are unbound, at rest and in their ground state. [1] The number of atoms in 12 grams (or, 0.012 kilograms) of carbon 12 is known as Avogadro's number. It is approximately 6.0221415×1023 (2002 CODATA value).
A mole is a dimensionless name for an integer, much like dozen or googol. Although the exact value of the mole is not known at present, it is equal to Avogadro's number, which is known to 1 part in 10 million.
Because of the relationship of the atomic mass unit to Avogadro's number, a practical way of stating this for atoms or molecules is: That amount of the substance containing exactly the same number of grams as the number of the atomic weight of the substance. Since iron, for example, has an atomic mass of 55.845, there are 55.845 grams in a mole of iron.
Other related archivesAvogadro's Law, Avogadro's number, CGPM (General Conference on Weights and Measures), CIPM (International Committee for Weights and Measures), CODATA, Chemistry, Einstein (unit), IUPAC, IUPAP, List of particles, Molarity, Mole Day, Physics, SI term, STP, Stoichiometry, Wilhelm Ostwald, amount of substance, atomic mass unit, atomic weight, atoms, burnt, carbon 12, carbon dioxide, chemical reaction, chemistry, dimensionless, dimensionless quantity, dozen, electrons, ethane, formula units, gas, googol, grams, ground state, ions, iron, litres, mL, molar volume, molecular mass, molecules, noble gases, oxygen, particles, u, water
 Adapted from the Wikipedia article "Definition", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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