Abstract: Pojam relativne atomske mase pojavljuje se u dva značenja: prvo proizlazi iz zakona stalnih masenih omjera („atomska težina“), a drugo, novije, iz definicije mola, kao Avogadrova broja atoma (čestica). U članku je opisana kako povijest određivanja „atomske težine“ (Dalton, Berzelius, Stas) tako i povijest njezina definiranja (prema vodiku, kisku ili nuklidu 12C). Dva značenja relativne atomske mase utjecala su i na način rješavanja stehiometrijskih zadataka.
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