Transcription of Chapter 3 Notes - Stoichiometry
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Chapter 3 Notes - Stoichiometry
AP ChemistryA. AllanChapter 3 Notes - Atomic MassesA. C-12, the Relative Standard1. C-12 is assigned a mass of exactly 12 atomic mass units (amu)2. Masses of all elements are determined in comparison to the carbon -12 atom (12C) the most common isotope of carbon3. Comparisons are made using a mass spectrometerB. Atomic Mass (Average atomic mass, atomic weight)1. Atomic masses are the average of the naturally occurring isotopes ofan element2. Atomic mass does not represent the mass of any actual atom3. Atomic mass can be used to "weigh out" large numbers of The MoleA. Avogadro's number1. x 1023 units = 1 mole2. Named in honor of Avogadro (he did NOT discover it)B. Measuring moles1. An element's atomic mass expressed in grams contains 1 mole ofatoms of that elementa.
Chapter 3 Notes - Stoichiometry 3.1 Atomic Masses A. C-12, the Relative Standard 1. C-12 is assigned a mass of exactly 12 atomic mass units (amu) 2. Masses of all elements are determined in comparison to the carbon - 12 atom (12C) the most common isotope of carbon 3…
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