Chapter 7

# Chapter 7 - I. A. 1) B.(orFormulaMass 1)AtomicMass:

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Chapter 7-Chemical Formula Problems I. Formulas and Formula Mass A. The Number of Atoms in a formula 1) Determine the number of atoms of each element. B. Calculating the Molecular Mass (or Formula Mass) 1) Atomic Mass: Average mass of atoms of an element compared to atom of carbon-12 as exactly 12 amu. Atomic mass of Carbon = 12.01 amu 2) Molecular Mass: Average Mass of Molecules compared to atom of carbon-12 as exactly 12 amu. 3) Formula Mass: Average mass of formula units(ionic compounds) compared to atom of carbon-12 as exactly 12 amu. 4. Formula Mass= (funny looking E which means Mass) atomic masses in formula unit 5. Examples: (In notebook) II. The Mole Concept A. Def: One mole is that amount of any substance that contains the same number of units as the number of atoms in exactly 12 grams of carbon-12. B. Avogadro's Number: The number of particles in one mole. This number is 6.02 x 10^23 C. Molar Mass 1. Def: Mass in grams of 1 mole of a substance

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2. Elements Examples: (In notebook)
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## This note was uploaded on 04/08/2009 for the course CHM 109 taught by Professor Staff during the Fall '08 term at Grand Valley State.

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Chapter 7 - I. A. 1) B.(orFormulaMass 1)AtomicMass:

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