1. Chapter 12: Stoichiometry WASILLLA HIGH SCHOOL 2015 - 2016

2. Balanced Chemical Equations  A balanced chemical equation provides the same kind of quantitative information that a recipe does.

3. Using Everyday Equations  An equation can represent the manufacturing of a single tricycle. 12.1

4. How do chemists use balanced chemical equations?  Chemists use balanced chemical equations as a basis to calculate how much reactant is needed or product is formed in a reaction.  The calculation of quantities in chemical reactions is a subject of chemistry called stoichiometry.

5. Writing and Using Mole Ratios  Mole-Mole Calculations  A mole ratio is a conversion factor derived from the coefficients of a balanced chemical equation interpreted in terms of moles. 12.2

6. Solution Diagram 12.2

7. Moles to Moles – 1 step problem

8. Converting from moles to moles

9. Converting from grams to moles  2 step problems

10. Converting moles to grams How many moles of aluminum oxide would be produced from 85.0 grams of Aluminum?

11. Converting from grams to grams

12. Limiting Reagent  In a chemical reaction, you will always run out of one of the reactants first.  Whatever reactant you run out of first is the Limiting Reagent because it limits how much product you can make

13. Sample Problem:

15. % Yield  The percent yield is a measure of the efficiency of a reaction carried out in the laboratory.  The theoretical yield is the maximum amount of product that could be formed from given amounts of reactants.  In contrast, the amount of product that actually forms when the reaction is carried out in the laboratory is called the actual yield.