The Reliability of Values of Molar Mass, the Factor that Relates Measurements Expressed in Two SI Base Units (Mass and Amount of Substance).

In contrast with some other factors that relate SI quantities, those involving amount of substance vary by entity in their magnetude and their uncertainty. The mole-to-gram factor, called molar mass, like the mole itself, has to be defined by chemical formula, at times also by isotopic composition of constituent elements of a compound in a sample. Chemistry has long dependend greatly on the molar-mass values of the chemical elements in their natural terrestrial occurrence. The determination of these data has called for great skill in chemical analytical methods until isotope-ratio mass spectrometry provided values with smaller uncertainties. The best current knowledge of the set of molar-mass values is published biennally by IUPAC.

DE BIEVRE P.;  PEISER H. Steffen; 

1996-07-30

JRC13549

https://publications.jrc.ec.europa.eu/repository/handle/JRC13549,