No, the Molecular Mass of Bromobenzene Is Not 157 amu:: An Exercise in Mass Spectrometry and Isotopes for Early General Chemistry
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[1] Youngstown State University
Youngstown State University
City of Youngstown, Estados Unidos
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- Localización: Journal of chemical education, ISSN 0021-9584, Vol. 77, Nº 11 (November), 2000, págs. 1433-1433
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
Early in the general chemistry course, after they are introduced to the concepts of atomic weight, molecular mass, isotopes, ions, chemical formulas, and chemical equations, our students do a cooperative, guided-inquiry exercise involving interpretation of the mass spectrum of bromobenzene. This exercise illustrates, refines, reinforces, and extends these concepts while the students learn some chemical principles of electron-ionization mass spectrometry. Even with no background in bonding and structure, they can successfully interpret the output of a modern research instrument. They learn to identify an isotope pattern, assign chemical formulas to ions giving mass spectral peaks, calculate an average atomic weight (for bromine) from measured isotopic abundances, and write balanced equations for ion fragmentation reactions.
