3-a 2010 - Mass Relationships in Chemical Reactions Chapter...

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1 Mass Relationships in Chemical Reactions Chapter 3
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2 Atomic Mass and the Mole Chapter 3a (3.1-3.5)
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3 Atomic Mass Atomic mass unit 1. an atom relative to other atoms 1. Defined as: 12 C ≡ 12 amu Note that not the mass on the periodic table for carbon Remember Proton ~ Neutron ~ Electron ~
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4 Natural Abundance Definition 1 Definition 2 Mathematically % Abundance = Note: % abundance and atomic masses of the isotopes can be determined by; Mass spectrometry (3.4)
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5 Atomic mass/ natural abundance Most elements have more than 1 isotope Different isotopes have Neutrons have Different isotopes therefore have (not all atoms of the same element have the same mass) Early scientists deal w/mass ratios w/o knowing about isotopes but Each element has The isotopes of an element occur naturally in a specific ratio a natural sample of the element will have a characteristic average mass
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6 Average Atomic Mass Determination of: % Abundance isotope A x atomic mass isotope A
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This note was uploaded on 05/20/2010 for the course CHEM 1230 taught by Professor Anderson during the Spring '08 term at Toledo.

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3-a 2010 - Mass Relationships in Chemical Reactions Chapter...

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