lecture16 - Mass relationships Chem 1A Lecture 16: Final...

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Unformatted text preview: Mass relationships Chem 1A Lecture 16: Final calculator When : Thursday March 20 @ 8:00 am Where : SSLH 100 Bring: Index card phones Bring Not: Whats on it? Naming compounds (chapter 2) Lewis structures of covalent compounds (chapter 9) Formal charge and resonance structures (chapter 9) Electronegativity and bond polarity (chapter 9) Waves, photon energies and matter waves (chapter 7) Energy levels in hydrogen atom (chapter 7) Electron configurations (chapter 8) Periodic trends (chapter 8) Molecular geometry and VSEPR (chapter 10) Valence bond theory (chapter 10) Molecular orbital theory (chapter 10) Intermolecular interactions and states of matter (chapter 11) Types of solids (chapter 11) Mass relationships (chapter 3) Atomic Mass C 6 12.011 number of protons average atomic mass Atomic Mass unit of atomic mass is amu What is the atomic mass of 12 C? 12 C = 12 amu definition of amu: mass 12 C 12 1 amu = Atomic Mass average atomic mass (98.89%) 12 C (1.110%) 13 C = 12 amu = mass 13 C mass 12 C x 12 amu = 1.0836129 x 12 amu = 13.003355 amu average mass of carbon: 0.9889 x 12 amu + 0.01110 x 13.0034 = 12.01 am V from experiment Atomic Mass What is the average mass of other elements? average mass = av. mass element mass 12 C x 12 amu What is the average mass of aluminum? mass Al = 2.248 x 12 amu = 26.98 amu Al 13 26.98 Mole Given mass in grams, how many atoms in sample? 1 mole = 6.022 x 10 23 unit used in chemistry is mole: defined through: 12 g of 12 C = 1 mol = 6.022 x 10 23 (atoms) Remember, mole is a number : 1 dozen = 12 1 mole = 6.022 x 10 23 Mole How much is 1 mole of aluminum?...
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This note was uploaded on 02/25/2012 for the course CHEM 1A 40030 taught by Professor Borovick during the Fall '10 term at UC Irvine.

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lecture16 - Mass relationships Chem 1A Lecture 16: Final...

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