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Stoichiometry - Stoichiometry...

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Stoichiometry http://www.unit5.org/chemistry/Stoichiometry.html
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Stoichiometry Island Diagram Mass Particles Volume Mole Mole Mass Volume Particles Known Unknown Substance A Substance B Stoichiometry Island Diagram 1 mole = molar mass (g) Use coefficients from balanced chemical equation 1 mole = 22.4 L @ STP 1 mole = 6.022 x 10 23 particles (atoms or molecules) 1 mole = 22.4 L @ STP 1 mole = 6.022 x 10 23 particles (atoms or molecules) 1 mole = molar mass (g) (gases) (gases)
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Mass, Volume, Mole Relationship
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1 mol of a gas=22.4 L at STP Molar Volume at STP S tandard T emperature & P ressure 0 ° C   and   1 atm Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem
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? Visualizing a Chemical Reaction Na + Cl 2 NaCl ___ mole Cl 2 ___ mole NaCl ___ mole Na 2 10 5 10 2 5
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Formation of Ammonia
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Proportional Relationships I have 5 eggs. How many cookies can I make? 3/4 c. brown sugar 1 tsp vanilla extract 2 eggs 2 c. chocolate chips Makes 5 dozen cookies. 2 1/4 c. flour 1 tsp. baking soda 1 tsp. salt 1 c. butter 3/4 c. sugar 5 eggs 5 doz. 2 eggs = 12.5 dozen cookies Ratio of eggs to cookies Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem 150 cookies
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Proportional Relationships Stoichiometry Stoichiometry mass relationships between substances in a chemical reaction based on the mole ratio Mole Ratio Mole Ratio indicated by coefficients in a balanced equation 2 Mg + O 2 Mg + O 2 2 2 MgO 2 MgO Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem
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Stoichiometry Steps 1. Write a balanced equation. 2. Identify known & unknown. 3. Line up conversion factors. Mole ratio - moles moles Molar mass - moles grams Molarity - moles liters soln Molar volume - moles liters gas Core step in all stoichiometry problems!! Mole ratio - moles moles 4. Check answer. Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem
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Molar Volume at STP Molar Mass ( g/mol ) MASS IN GRAMS MOLES NUMBER OF PARTICLES LITERS OF SOLUTION Molar Volume ( 22.4 L/mol) LITERS OF GAS AT STP Molarity (mol/L) Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem
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Stoichiometry Problems How many moles of KClO 3 must decompose in order to produce 9 moles of oxygen gas? 9 mol O 2 2 mol KClO 3 3 mol O 2 = 6 mol KClO 3 2KClO 3 2KCl + 3O 2 ? mol 9 mol Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem
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How many grams of KClO 3 are required to produce 9.00 L of O 2 at STP? 9.00 L O 2 1 mol O 2 22.4 L O 2 = 32.8 g 2 mol KClO 3 3 mol O 2 122.55 g KClO 3 1 mol KClO 3 ? g 9.00 L Stoichiometry Problems 2KClO 3 2KCl + 3O 2 Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem
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Stoichiometry Problems How many grams of silver will be formed from 12.0 g copper? 12.0 g Cu 1 mol Cu 63.55 g Cu = 40.7 g Ag Cu + 2 AgNO 3 2 Ag + Cu(NO 3 ) 2 2 mol Ag 1 mol Cu 107.87 g Ag 1 mol Ag 12.0 g ? g Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem
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Stoichiometry KClO 3 KCl + O 2 3 2 2 500 g x g x L KClO 3 O 2 x L O 2 = 500 g KClO 3 122.5 g KClO 3 = 137 L O 2 1 mol KClO 3 3 mol O 2 2 mol KClO 3 22.4 L O 2 1 mol O
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