1. Stoichiometry Warmup I have 1 mole of CO 2 gas at STP. How many grams of CO 2 do I have? How many Liters of CO 2 do I have? How many molecules of CO 2 do I have?

2. Stoichiometry The relationship between reactants and products in a balanced chemical equation Mole Ratios

3. Stoichiometry If you know the moles of a substance, the balanced equation allows you to determine the moles of all other substances in the rxn

4. Stoichiometry Coefficients from balanced equations can be used to write conversion factors called mole ratios

5. Stoichiometry Write a balanced equation for the following rxn: Hydrogen + nitrogen  ammonia

6. Stoichiometry How many moles of ammonia are produced when 0.60 mol of nitrogen reacts with hydrogen?

7. Stoichiometry How many moles of hydrogen gas are needed to react with 0.60 mol of nitrogen gas?

8. Stoichiometry How many grams of ammonia are produced by the reaction of 5.40g of hydrogen with excess nitrogen?

9. Stoichiometry How many grams of nitrogen are needed to react with 5.40g of hydrogen?

10. Stoichiometry

11. How many molecules of oxygen are produced when 29.2g of water are decomposed?

12. Limiting vs. Excess Reagents Limiting Reagent =The reactant that determines the amount of product formed in a rxn. Completely consumed in the rxn.

13. Limiting vs. Excess Reagents Excess Reagent = the reactant that is not completely used up

14. Limiting vs. Excess Reagents If you have 6.70 mole of Na and 3.20 mol Cl 2, which is the LR? How many moles of NaCl is produced? How many moles of ER remain?

15. Limiting vs. Excess Reagents What is the limiting reagent when 80.0g Cu reacts with 25.0g S? What is the maximum amount of Cu 2 S in grams that can be formed? How many grams of ER remain?

16. LR video http://education- portal.com/academy/lesson/limiting- reactants-calculating-excess- reactants.html#lesson

17. Yield Video http://education- portal.com/academy/lesson/calculating- reaction-yield-and-percentage-yield-from-a- limiting-reactant.html#lesson

18. Theoretical Yield Theoretical Yield = maximum amount of product that can be formed from given amounts of reactants (based on calculation from the LR)

19. Actual Yield Actual Yield = the amount of product formed when the rxn is carried out in the lab Based on experimentation

20. Percent Yield Percent Yield = actual yield / theoretical yield x 100

21. Percent Yield What is the percent yield of CaO when 24.8g of CaCO 3 is heated and 13.1g CaO is produced in the lab? CaCO 3  CaO + CO 2

22. Stoichiometry Review

23. What is the LR? 4 moles of oxygen gas react with 16 moles of H 2 gas.What is the LR? What is the theoretical yield of product?

24. What is the percent yield? The burning of 18.0g of carbon in oxygen produces 55.0g of carbon dioxide.

25. Review Question Write a balanced equation for the reaction that occurs when Magnesium metal reacts with Hydrochloric acid.

26. Review Question If 10.0g of Magnesium is mixed with 35.0g of Hydrochloric acid, what is the LR?

27. Review Question What is the theoretical yield of magnesium chloride?

28. Review Question What is the percent yield of Magnesium chloride if 35.0g is produced in the lab?

29. Review Question How much excess reagent remains?