Presentation on theme: "Limiting Reagent/Reactant Ms. Knick HAHS"— Presentation transcript:
Limiting Reagent/Reactant Ms. Knick 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 happens in a chemical reaction, if there is an insufficient amount of one reactant?
Limiting Reagent: the reagent that is completely used up in a chemical reaction. Excess Reagent: reagent not completely used up in a chemical reaction.
Example: Find the limiting reagent when 1.22g O 2 reacts with 1.05g H 2 to produce H 2 O. How many grams of water will be produced?
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.
Example: Find the limiting reagent when 1.22g O 2 reacts with 1.05g H 2 to produce H 2 O. How many grams of water will be produced? Calculate H 2 O moles produced by using each of the reactants. The actual amount H 2 O produced is the smaller one of the two values. Use the smaller mole value to convert to grams. This is the theoretical yield.