Transcription of Chapter 3 Notes - Stoichiometry - ScienceGeek.net
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Chapter 3 Notes - Stoichiometry - ScienceGeek.net
AP Chemistry A. Allan Chapter 3 Notes - Stoichiometry Counting by Weighing A. Average Mass 1. When a particle (or object) has a characteristic AVERAGE mass, then counting large numbers can be done by weighing B. Assumptions 1. Large sample size 2. A representative sample (it represents the assumed average) 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. Comparisons are made using a mass spectrometer B.
AP Chemistry . A. Allan . Chapter 3 Notes - Stoichiometry . 3.1 Counting by Weighing . A. Average Mass . 1. When a particle (or object) has a characteristic AVERAGE mass, then
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