Chapter 3 -lecture 4

Chapter 3 -lecture 4 - General Chemistry I Fall 2007 Joann...

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Unformatted text preview: General Chemistry I Fall 2007 Joann S. Monko Chemistry 9th ed. Raymond Chang Balancing Balancing Equations Equations _ _ _C _C 3 H H 8 8 (g) (g) + + _ _ _ O _ O 2 2 (g) (g)---> ---> _ _ _CO _CO 2 2 (g) (g) + + _ _ _ H _ H 2 O O (g) (g) _ _ _B _B 4 4 H H 10 10 (g) (g) + + _ _ _ O _ O 2 2 (g) (g)---> ---> _ _ _ B _ B 2 2 O O 3 3 (g) (g) + + _ _ _H _H 2 2 O O (g) (g) _ _ _Li _Li 3 3 N N (s) (s) + __ H + __ H 2 2 O O (l) (l)---> ---> _ _ _NH _NH 3 3 (g) (g) + + __ __ LiOH LiOH (aq) (aq) _ Mg _ Mg 3 B B 2 (s) (s) + _ H + _ H 2 O O (l) (l)---> _ Mg(OH)---> _ Mg(OH) 2 (aq) (aq) + _ B + _ B 2 H H 6 ( g ) 1 5 3 4 1 3 1 3 1 6 3 1 2 11 4 10 Clicker Question Balance the equation: __ Al + __ H 2 SO 4 __ Al 2 (SO 4 ) 3 + __ H 2 The coefficient in front of the sulfuric acid is… A. 1 B. 2 C. 3 D. 5 E. 6 STOI CH I OMETRY- the study of the quantitative aspects of - the study of the quantitative aspects of chemical reactions. chemical reactions. Reactants: Zn + I Reactants: Zn + I 2 2 Product: Zn I Product: Zn I 2 2 Kotz &Treichel Chemistry & Chemical Reactivity 5th ed. 1. Write the balanced chemical equation. 1. Convert given substances into moles. 1. Use coefficients from the balanced equation to calculate the # of moles of what you want. 1. Convert moles of sought quantity into desired units usually grams). Calculations in Chemical Reactions Chemistry, 8 th ed. Chang GENERAL PLAN FOR GENERAL PLAN FOR STOI CHI OMETRY STOI CHI OMETRY CALCULATI ONS CALCULATI ONS Mass reactant Stoichiometric factor Moles reactant Moles product Mass product molar mass molar mass % yield = actual yield theoretical yield • 100% The maximum quantity of product that can be obtained by a chemical reaction – Theoretical Yield Losses occur: unreacted material, isolation & purification processes A measure of how close the actual yield comes to the theoretical yield - Percent Yield Kotz &Treichel Chemistry & Chemical Reactivity 5th ed. 2 Al...
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