# Limiting Reagent/Reactant Ms. Knick HAHS

## Presentation on theme: "Limiting Reagent/Reactant Ms. Knick HAHS"— Presentation transcript:

Limiting Reagent/Reactant Ms. Knick HAHS http://www.kitmondo.com/images%5Clisting%5CDe%20Dietrich%20GL-750%20Glass-Lined%20Jacketed%20Reactor-%20MT-1%20(Pic1).JPG

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? http://ossfabricators.com/photos/reactor2.jpg

 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.