1. Percent Yield Objectives: 6.0 Solve stoichiometric problems involving relationships among the number of particles, moles, and masses of reactants and products in a chemical reaction 6.3 Identifying the nomenclature of ionic compounds, binary compounds, and acids

2. Batting Averages If a softball player has 23 hits after 90 times at bat, how would you determine the efficiency of her batting? What is the efficiency of her batting? What is her batting average? How do you think the efficiency of a chemical reaction might be measured?

3. Think Back to the Lab Did any of you reheat your reactants until your masses were within 0.01 grams of each other? If not, your reaction didn’t go to completion --- simply due to time restraints. However, many reactions stop before all the reactants are used up.

4. Theoretical Yield You know how to calculate how much product you SHOULD get, right? This is called theoretical yield: the maximum amount of product that can be produced from a given amount of reactant What do you think actual yield is, and how would you determine it? Answer: the actual amount of product produced in an experiment; measure the mass of the product!

5. Percent Yield Def: the ratio of actual yield to theoretical yield. % yield = actual yield (experimental) x100 theoretical yield (calculated)

6. Example Problems & Assignment Example: Practice Problem #27 (p.372) Also refer to Example Problem in book on p. 371. Assignment: Practice Problems 28-29 (p.372) and #34 (p.373)