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Mole unit - History | | Mole unit - History: Encyclopedia II - Mole unit - History | | The name mole is attributed to Wilhelm Ostwald who introduced the concept in the year 1902. He used it to express the gram molecular weight of a substance. So, for example, 1 mole of hydrochloric acid (HCl) has a mass of 36.5 grams (atomic weights Cl: 35.5 u, H: 1.0 u).
Prior to 1959 both the IUPAP and IUPAC used oxygen to define the mole, the chemists defining the mole as the number of atoms of oxygen which had mass 16 g, the physicists using a similar definition but with the oxygen-16 isotope only. The two organizations agreed in ...
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 - History
Mole unit - History
The name mole is attributed to Wilhelm Ostwald who introduced the concept in the year 1902. He used it to express the gram molecular weight of a substance. So, for example, 1 mole of hydrochloric acid (HCl) has a mass of 36.5 grams (atomic weights Cl: 35.5 u, H: 1.0 u).
Prior to 1959 both the IUPAP and IUPAC used oxygen to define the mole, the chemists defining the mole as the number of atoms of oxygen which had mass 16 g, the physicists using a similar definition but with the oxygen-16 isotope only. The two organizations agreed in 1959/1960 to define the mole as such:
This was adopted by the CIPM (International Committee for Weights and Measures) in 1967, and in 1971 it was adopted by the 14th CGPM (General Conference on Weights and Measures)
In 1980 the CIPM clarified the above definition, defining that the carbon-12 atoms are unbound and in their ground state.
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 "History", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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