1. Limiting Reagent/Reactant
Mrs. Taylor
HAHS

2. Reacting Amounts In a table setting, there is 1
plate, 1 fork, 1 knife, and
1 spoon.
How many table settings are
possible from 5 plates, 6 forks,
4 spoons, and 7 knives?
What is the limiting item?
What are the excess items?
How much of the excess items will remain?

3. What happens in a chemical reaction, if there is an insufficient amount of one reactant?

4. Limiting Reagent: the reagent that is completely used up in a chemical reaction.
Excess Reagent: reagent not completely used up in a chemical reaction.

5. Method
Use the moles of each of the reactant to calculate the product of interest.
The reactant that yields the smaller calculated value of product is the limiting reagent.
This calculated amount is also known as the theoretical yield.

6. Example #1: Find the limiting reagent when 1. 22g O2 reacts with 1
Example #1: Find the limiting reagent when 1.22g O2 reacts with 1.05g H2 to produce H2O. How many grams of water will be produced?

7. Example #2:
__C3H8 +  __O2    > __CO2   +   __H2O
If you start with 14.8 g of C3H8 and 3.44 g of O2, how many grams of CO2 will be produced?
What is the limiting reactant? What is the excess reactant?
How much excess reactant is left over?

8. You are working for a company that packages school supplies for students. Your boss tells you that each bag must contain:
2 ink pens
4 paper clips
1 binder clip
1 piece of chalk

9. Questions: How many packages were you able to make? __________
What item was your limiting reactant? __________
What item was your excess reactant? ____________