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

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?

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.

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!

Percent Yield• Def: the ratio of actual yield to theoretical

yield.% yield = actual yield (experimental) x100

theoretical yield (calculated)

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)