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

2. 1. If you have 200 tires, how many cars can you make?           2. If you have 200 tires, how many motorcycles can you make?    

4. 3. Consider: Pb(NO3)2(aq) + 2 NaCl(aq) --> PbCl2(s) + 2 NaNO3(aq) If you have 5 moles of Pb(NO3)2, how many moles of PbCl2 can you make? Consider: If you have 5 moles of NaCl, how many moles of PbCl2 can you make?

5. How to Balance Equations
One element at a time
Trial and error
Al Br Al2Br6

6. CH3CH2OH O CO H2O
CH3OH O CO H2O

7. General Stoichiometry Route
Grams
reactant
Moles
reactant
Moles
product
Grams
product
amounts
table
2 CH3OH O CO H2O
If we react 100 grams of CH3OH, how many grams of H2O are formed?

11. 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

12. 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.

13. Example 3.
Which reaction is correct?

16. A hard OWL Question:

17. Alum Lab Calculations:
Let’s say you start with g Al and make 14.8 g KAl(SO4)212 H2O product.
What is the percent yield?
Molar masses: Al = 26.98; KAl(SO4)212 H2O = g/mol

18. Chemical Analysis

19. Chemical Analysis: Determining Formulas