Limiting Reagent/Reactant Ms. Knick HAHS

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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.