Reaction Stoichiometry Weight relations in chemical reactions 1

1. If you have 200 tires, how many cars can you make? 1. 200

3. Consider: Pb(NO 3)2(aq) + 2 Na. Cl(aq) --> Pb. Cl 2(s) + 2

How to Balance Equations • One element at a time • Trial and error

General Stoichiometry Route Grams reactant Moles reactant 2 CH 3 OH + 3 O

Cu(s) + 4 HNO 3(aq) Cu(NO 3)2(aq) + 2 NO 2(g) + 2 H

Alum Lab Calculations: Let’s say you start with 0. 985 g Al and make

Limiting Reactants 1. If you have 200 tires and 75 steering wheels, how many

Example 2. A cake recipe calls for 3 eggs, 2 cups of flour, and

Chemical Analysis: Determining Formulas 0. 163 g Galbraith Labs 0. 600 g

2. 34 g of Ru react with CO to form 5. 59 g of

Room full of people and puppies: people = 140 lbs each puppies = 20

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Reaction Stoichiometry Weight relations in chemical reactions: 1. If I react this much, how much product do I get? 2. If I need this much product, how much do I need to react

1. If you have 200 tires, how many cars can you make? 1. 200 2. 100 3. 800 4. 50 2. If you have 200 tires, how many motorcycles can you make? 1. 200 2. 100 3. 800 4. 50

3. Consider: Pb(NO 3)2(aq) + 2 Na. Cl(aq) --> Pb. Cl 2(s) + 2 Na. NO 3(aq) If you have 5 moles of Pb(NO 3)2, how many moles of Pb. Cl 2 can you make? 1. 5 2. 10 3. 2. 5 4. Consider: Pb(NO 3)2(aq) + 2 Na. Cl(aq) --> Pb. Cl 2(s) + 2 Na. NO 3(aq) If you have 5 moles of Na. Cl, how many moles of Pb. Cl 2 can you make? 1. 5 2. 10 3. 2. 5

How to Balance Equations • One element at a time • Trial and error Al + Br 2 Al 2 Br 6

CH 3 CH 2 OH + CH 3 OH + O 2 CO 2 + H 2 O

General Stoichiometry Route Grams reactant Moles reactant 2 CH 3 OH + 3 O 2 amounts table Moles product 2 CO 2 + 4 H 2 O If we react 100 grams of CH 3 OH, how many grams of H 2 O are formed? Grams product

Cu(s) + 4 HNO 3(aq) Cu(NO 3)2(aq) + 2 NO 2(g) + 2 H 2 O(l)

Alum Lab Calculations: Let’s say you start with 0. 985 g Al and make 14. 8 g KAl(SO 4)2 12 H 2 O product. What is the percent yield? Molar masses: Al = 26. 98; KAl(SO 4)2 12 H 2 O = 474. 37 g/mol

Limiting Reactants 1. If you have 200 tires and 75 steering wheels, how many cars can you make? 1. 200 2. 75 3. 50 4. 100

Limiting Reactants and Love

Example 3. Which reaction is correct?

Example 2. A cake recipe calls for 3 eggs, 2 cups of flour, and 3 teaspoons of sugar. If you have: • 9 eggs • 8 cups of flour • 12 teaspoons of sugar how many cakes can you make? Enter the number of cakes.

A hard OWL Question:

Chemical Analysis

Chemical Analysis: Determining Formulas 0. 163 g Galbraith Labs 0. 600 g

2. 34 g of Ru react with CO to form 5. 59 g of Ru(CO)x. What is x?

Room full of people and puppies: people = 140 lbs each puppies = 20 lbs each Want to know weight % of people. So, you cut off the people’s hands and find you get 44 of them.