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|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|
|Type:||Articles in periodicals and books|
|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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