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Letter
Correctly Expressing Atomic Weights
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Abstract
While agreeing with the reasoning expressed in the letter by George Gorin, we would like to underline the following points. His starting point is that "the numbers in question" are to be multiplied by 1 g/mol in order to obtain the molar mass or mass of a mole, and by 1 dalton/molecule to obtain the mass (in daltons) of a molecule: it is clear that the "numbers in question" are the molecular weights expressed as pure numbers. By contrast, we discussed the possibility of expressing molecular weights either by pure numbers, or by the dalton unit (according to a more general way of expressing quantities).
Keywords (Audience):
High School / Introductory ChemistryKeywords (Domain):
DemonstrationsKeywords (Feature):
LettersKeywords (Pedagogy):
Textbooks / Reference BooksKeywords (Subject):
Nomenclature / Units / SymbolsCiting Articles
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This article has been cited by 1 ACS Journal articles (1 most recent appear below).
How Many Digits Should We Use in Formula or Molar Mass Calculations?
Christer SvenssonJournal of Chemical Education2004 81 (6), 827How Many Digits Should We Use in Formula or Molar Mass Calculations?
Christer SvenssonJournal of Chemical Education2004 81 (6), 827This article addresses the question often asked by students, “How many digits should I use when calculating the formula or molar mass of a substance?†Three rules of increasing complexity are proposed and discussed. Elementary propagation of error ...
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History
- Received: August 03, 2009
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