Lecture_Notes_090409a

# Lecture_Notes_090409a - 23 things in a mole The Mole A B C...

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STOICHIOMETRY Zumdahl Chapter 3

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Stoichiometry y The study of quantities of matter consumed and produced in a chemical reaction y Why do we care?
Relative and Atomic Masses y Need to define an mass unit for atoms y Set m( 12 C) = 12.0000000 atomic mass units (amu) y Base all other masses on this y 13 C Æ 13.0034 amu: 1.11 % y 12 C Æ 12.0000 amu: 98.89 %

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How to Measure Atomic Masses
Which do you think is the most abundant? 70Ge 7 2 Ge 73Ge 4 76Ge 2% 31% 2% 6% 58% 1. 70 Ge 2. 72 Ge 3. 73 Ge 4. 74 Ge 5. 76 Ge

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Determining Average Atomic Mass Isotope Atomic Mass Relative Abundance 70 Ge 69.924 amu 20.5 % 72 Ge 71.922 amu 27.4 % 73 Ge 72.923 amu 7.8 % 74 Ge 73.921 amu 36.5 % 76 Ge 75.921 amu 7.8 %
Relation to kg

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Microscopic Microscopic Macroscopic Macroscopic y Atomic Mass Units { 1 carbon atom = 12.011 amu { 1 sulfur atom = 32.07 amu { 1 oxygen atom = 16.00 amu { 1 gold atom = 197.00 amu y Define a Mole and use it to get grams { 1 mole carbon = 12.011 g { 1 mole sulfur = 32.07 g { 1 mole oxygen = 16.00 g { 1 mole gold = 197.00 g Relative Mass Scales (amu vs g)
The Mole Avogadro’s number: 6.02214 x 10

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Unformatted text preview: 23 things in a mole The Mole A B C What elements are A, B, and C? Cu , Hg S Cu, Ge e Co, Hg, P Co, G 56% 17% 7% 20% 1. Cu, Hg, S 2. Cu, Ge, Se 3. Co, Hg, P 4. Co, Ge, S Using the Mole y Determine the number of atoms in 2.45 mol of copper. What is the mass of this number of copper atoms? y A pure silver ring contains 2.80 x 10 22 silver atoms. How many moles of silver atoms are there? What is the mass of the ring? Chemical Formulas y Empirical Formula { Simplest formula with the correct relative number of atoms in the molecule y Molecular Formula { Formula with the correct number of atoms in the molecule. A whole number multiple of the empirical formula y Ionic Formula { Empirical formulas for ionic solids Molar Mass y The mass of one mole of a compound y Determine the molar mass of the following molecules and compounds: NaCl, CrSO 4 , C 48 H 28 N 4 O 8...
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Lecture_Notes_090409a - 23 things in a mole The Mole A B C...

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