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Mole unit - Elementary entities | | Mole unit - Elementary entities: Encyclopedia II - Mole unit - Elementary entities | | When the mole is used to specify the amount of a substance, the kind of elementary entities (particles) in the substance must be identified. The particles can be atoms, molecules, ions, formula units, electrons, or other particles. For example, one mole of water is equivalent to about 18 grams of water and contains one mole of H2O molecules, but three moles of atoms (two moles H and one mole O).
When the substance of interest is a gas, the particles are usually molecules. However, the noble gases (He, Ar, Ne, Kr, Xe, Rn) ar ...
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 - Elementary entities
Mole unit - Elementary entities
When the mole is used to specify the amount of a substance, the kind of elementary entities (particles) in the substance must be identified. The particles can be atoms, molecules, ions, formula units, electrons, or other particles. For example, one mole of water is equivalent to about 18 grams of water and contains one mole of H2O molecules, but three moles of atoms (two moles H and one mole O).
When the substance of interest is a gas, the particles are usually molecules. However, the noble gases (He, Ar, Ne, Kr, Xe, Rn) are all monoatomic, that is each particle of gas is a single atom. All gases have the same molar volume of 22.4 litres per mole at STP (see Avogadro's Law).
A mole of atoms or molecules is also called a "gram atom" or "gram molecule".
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 "Elementary entities", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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