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- Title
Relativna atomska masa – što je to?
- Authors
Raos, N.
- Abstract
There are two basic understandings of relative atomic mass. The first (“atomic weight”) stems from the law of constant and multiple mass proportions and has no reference to the size and the absolute mass of atoms. “Atomic weights” were defined and measured in the 19th Century, and at that time atoms and molecules were just hypothetical particles. However, in the 20th Century, it became possible to measure the number and mass of atoms, and relative atomic mass was defined in reference to the mass and number of atoms, i.e. Avogadro constant and mole. This also resulted in the change of reference unit, Ar(H) = 1 or Ar(O) = 16, for Ar(12C) = 12, and the way of teaching of stoichiometry (calculations via nA instead of using proportionality principle). This article also describes the history of “atomic weight” determination by gravimetric analysis, especially the work of J. J. Berzelius and J. S. Stas.
- Subjects
ATOMIC weights; HYPOTHETICAL particles; CHEMISTRY education; HISTORY of chemistry; GRAVIMETRIC analysis; STOICHIOMETRY
- Publication
Kemija u Industriji, 2021, Vol 70, Issue 5/6, p319
- ISSN
0022-9830
- Publication type
Article
- DOI
10.15255/KUI.2018.042