Chapter 6 Lecture

Chapter 6 Lecture - Chapter 6 Quantities in Chemical...

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Quantities in Chemical Reactions Chapter 6
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Questions for consideration 1. What do coefficients in balanced equations represent? 2. How can we use a balanced equation to relate the number of moles of reactants and products in a chemical reaction? 3. How can we use a balanced equation to relate the mass of reactants and products in a chemical reaction? 4. How do we determine which reactant limits the amount of product that can form? 5. How can we compare the amount of product we actually obtain to the amount we expect to obtain? 6. How can we describe and measure energy changes?
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Math tools used 1. Units and conversions
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Information Contained in a Balanced Equation Viewed in Terms of Reactants C 3 H 8 (g) + 5O 2 (g) Products 3CO 2 (g) + 4H 2 O(g) molecules 3 molecules CO 2 + 4 molecules H 2 O 1 molecule C 3 H 8 + 5 molecules O 2 amount (mol) 1 mol C 3 H 8 + 5 mol O 2 3 mol CO 2 + 4 mol H 2 O 44.09 amu C 3 H 8 + 160.00 amu O 2 mass (amu) 132.03 amu CO 2 + 72.06 amu H 2 O mass (g) 44.09 g C 3 H 8 + 160.00 g O 2 132.03 g CO 2 + 72.06 g H 2 O total mass (g) 204.09 g 204.09 g
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Relationships between Reactants and Products C 3 H 8 ( g ) + 5 O 2 ( g ) 3 CO 2 ( g ) + 4 H 2 O ( g ) 1 molecule 5 molecules 3 molecules 4 molecules 2 molecules 10 molecules 6 molecules 8 molecules 100 molecules 500 molecules 300 molecules 400 molecules 6.022 x 10 23 molecules 5 x (6.022 x 10 23 ) molecules 3 x (6.022 x 10 23 ) molecules 4 x (6.022 x 10 23 ) molecules 1 mole 5 moles 3 moles 4 moles
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MASS(g) of compound A AMOUNT(mol) of compound A MOLECULES (or formula units) of compound A Avogadro’s number (molecules/mol) M (g/mol) of compound A molar ratio from balanced equation Summary of the mass-mole-number relationships in a chemical reaction. MASS(g) of compound B AMOUNT(mol) of compound B MOLECULES (or formula units) of compound B Avogadro’s number (molecules/mol) M (g/mol) of compound B
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Consider the following reaction: 2 C 6 H 6 ( g ) + 15 O 2 ( g ) 12 CO 2 ( g ) + 6 H 2 O ( g ) 1. What is the mole ratio of O 2 to C 6 H 6 ? 2. How many moles of O
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Chapter 6 Lecture - Chapter 6 Quantities in Chemical...

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