Title: The Reliability of Values of Molar Mass, the Factor that Relates Measurements Expressed in Two SI Base Units (Mass and Amount of Substance).
Authors: DE BIEVRE P.PEISER H. steffen
Citation: Metrologia vol. 34 p. 49-59
Publication Year: 1997
JRC Publication N°: JRC13549
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC13549
Type: Articles in Journals
Abstract: 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.
JRC Institute:Institute for Reference Materials and Measurements

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