1. Stoichiometry 2 slices bread + 1 slice ham  1 ham sandwich

2. What is stoichiometry? Comes from the Greek words stoicheion, meaning element and metron, meaning measure. In the real world, chemists perform reactions to make useful chemical compounds such as medicines, fibers, pigments, cosmetics and structural materials. Because some reactants are expensive chemists don’t just mix huge quantities of chemicals together and hope for the best; rather they use stoichiometry to calculate the mass relationships between products and reactants.

3. Mole Ratios Mole ratios are the key to stoichiometric calculations. They give us the ratios between the amounts of reactants and products in any given reaction. We get mole ratios from the coefficients. That’s why we need to start with a balanced equation.

4. Mole Ratios Start with a balanced equation The coefficients represent moles Divide one coefficient by the other to get the mole ratio

5. Mole Ratios 2 slices bread 1 slice ham 1 ham sandwich What is the mole ratio of bread slices to ham slices?

6. Mole Ratios 2 slices bread 1 slice ham 1 ham sandwich What is the mole ratio of bread slices to ham slices? 2/1

7. Mole Ratios 2 slices bread 1 slice ham 1 ham sandwich What is the mole ratio of bread slices to ham slices? 2/1 What is the mole ratio of ham slices to ham sandwiches?

8. Mole Ratios 2 slices bread 1 slice ham 1 ham sandwich What is the mole ratio of bread slices to ham slices? 2/1 What is the mole ratio of ham slices to ham sandwiches? 1/1

9. Mole Ratios 2 slices bread 1 slice ham 1 ham sandwich What is the mole ratio of bread slices to ham slices? 2/1 What is the mole ratio of ham slices to ham sandwiches? 1/1 What is the mole ratio of ham sandwiches to bread slices?

10. Mole Ratios 2 slices bread 1 slice ham 1 ham sandwich What is the mole ratio of bread slices to ham slices? 2/1 What is the mole ratio of ham slices to ham sandwiches? 1/1 What is the mole ratio of ham sandwiches to bread slices?1/2

11. Mole Ratios C3H8C3H8 5O 2 3CO 2 4H 2 O What is the mole ratio of propane to oxygen?

12. Mole Ratios C3H8C3H8 5O 2 3CO 2 4H 2 O What is the mole ratio of propane to oxygen?1/5

13. Mole Ratios C3H8C3H8 5O 2 3CO 2 4H 2 O What is the mole ratio of propane to oxygen?1/5 What is the mole ratio of propane to carbon dioxide?

14. Mole Ratios C3H8C3H8 5O 2 3CO 2 4H 2 O What is the mole ratio of propane to oxygen?1/5 What is the mole ratio of propane to carbon dioxide?1/3

15. Mole Ratios C3H8C3H8 5O 2 3CO 2 4H 2 O What is the mole ratio of propane to oxygen?1/5 What is the mole ratio of propane to carbon dioxide?1/3 What is the mole ratio of oxygen to water?

16. Mole Ratios C3H8C3H8 5O 2 3CO 2 4H 2 O What is the mole ratio of propane to oxygen?1/5 What is the mole ratio of propane to carbon dioxide?1/3 What is the mole ratio of oxygen to water?5/4

17. Mole Ratios C3H8C3H8 5O 2 3CO 2 4H 2 O What is the mole ratio of propane to oxygen?1/5 What is the mole ratio of propane to carbon dioxide?1/3 What is the mole ratio of oxygen to water?5/4 How many moles of carbon dioxide are made from 2 moles of propane?

18. Mole Ratios C3H8C3H8 5O 2 3CO 2 4H 2 O What is the mole ratio of propane to oxygen?1/5 What is the mole ratio of propane to carbon dioxide?1/3 What is the mole ratio of oxygen to water?5/4 How many moles of carbon dioxide are made from 2 moles of propane? 6

19. Mole Ratios C3H8C3H8 5O 2 3CO 2 4H 2 O What is the mole ratio of propane to oxygen?1/5 What is the mole ratio of propane to carbon dioxide?1/3 What is the mole ratio of oxygen to water?5/4 How many moles of carbon dioxide are made from 2 moles of propane? 6 Do you think you could determine how many kg of carbon dioxide are produced by one kg of propane? Take 2 minutes and write out your method.

20. Mole Ratios C3H8C3H8 5O 2 3CO 2 4H 2 O What is the mole ratio of propane to oxygen?1/5 What is the mole ratio of propane to carbon dioxide?1/3 What is the mole ratio of oxygen to water?5/4 How many moles of carbon dioxide are made from 2 moles of propane? 6 Do you think you could determine how many kg of carbon dioxide are produced by one kg of propane? Take 2 minutes and write out your method. Convert 1 kg propane to moles > multiply by mole ratio of 3 to get moles of carbon dioxide > Convert moles of carbon dioxide to kg.