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I. I.Stoichiometric Calculations (p ) Stoichiometry – Ch. 9

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A. Proportional Relationships b 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 eggs5 doz. 2 eggs = 12.5 dozen cookies Ratio of eggs to cookies

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A. Proportional Relationships b Stoichiometry mass relationships between substances in a chemical reaction based on the mole ratio b Mole Ratio indicated by coefficients in a balanced equation 2 Mg + O 2 2 MgO

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B. 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.

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1 mol of a gas=22.4 L at STP C. Molar Volume at STP S tandard T emperature & P ressure 0°C and 1 atm

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C. Molar Volume at STP Molar Mass (g/mol) particles/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)

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D. Stoichiometry Problems b 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 ? mol9 mol

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b How many grams of KClO 3 are reqd to produce 9.00 L of O 2 at STP? 9.00 L O 2 1 mol O L O 2 = 32.8 g KClO 3 2 mol KClO 3 3 mol O g KClO 3 1 mol KClO 3 ? g9.00 L D. Stoichiometry Problems 2KClO 3 2KCl + 3O 2

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D. Stoichiometry Problems b How many grams of silver will be formed from 12.0 g copper reacting with silver nitrate? 12.0 g Cu 1 mol Cu g Cu = 40.7 g Ag Cu + 2AgNO 3 2Ag + Cu(NO 3 ) 2 2 mol Ag 1 mol Cu g Ag 1 mol Ag 12.0 g? g

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63.55 g Cu 1 mol Cu D. Stoichiometry Problems b How many grams of Cu are required to react with 1.5 L of 0.10M AgNO 3 ? 1.5 L.10 mol AgNO 3 1 L = 4.8 g Cu Cu + 2AgNO 3 2Ag + Cu(NO 3 ) 2 1 mol Cu 2 mol AgNO 3 ? g 1.5L 0.10M

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D. Stoichiometry Problems – Mole-Mole b N 2 H 4 + N 2 O 4 N 2 + H 2 O BE SURE TO BALANCE THE EQUATION FIRST!! b ? moles N 2 O 4 = 2.72 moles N 2 H mol N 2 H 4 1 mol N 2 O 4 2 mol N 2 H 4 ? mol 2.72 mol = 1.36 mol N 2 O 4

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D. Stoichiometry Problems b Work on Handout – Mole-Mole Problems

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D. Stoichiometry Problems – Mole/Mass b In photosynthesis, carbon dioxide and water react to form glucose, C 6 H 12 O 6 and oxygen gas. ___CO 2 + ___H 2 O ___C 6 H 12 O 6 + ___O 2 If 15.6 grams of carbon dioxide react, how many moles of glucose will be produced? How many grams of carbon dioxide must react to produce 0.25 moles of glucose? g CO g CO 2 1 mol CO 2 6 mol CO 2 1 mol C 2 H 12 O 6 = mol C 2 H 12 O g CO 2 6 mol CO 2 1 mol CO mol C 2 H 12 O 6 = 66 g CO 2 1 mol C 2 H 12 O 6

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D. Stoichiometry Problems b Work on Handout – Mole-Mass Problems

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D. Stoichiometry Problems – Mass/Mass b Sodium metal reacts with oxygen gas to produce solid sodium oxide. How many grams of sodium must react to produce 42.0 grams of sodium oxide? 4Na + O 2 2Na 2 O ? g 42.0 g 42.0 g Na 2 O g Na 2 O 1 mol Na 2 O 2 mol Na 2 O 4 mol Na 1 mol Na g Na = g Na

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D. Stoichiometry Problems b Work on Handout – Mass-Mass Problems

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