Limited Reactants

A reactant that is totally consumed during a chemical reaction, limits the extent of the reaction, and determines the amount of product

• stoichiometry

• mole ratio

• excess reactant

• limiting reactant
  

To determine the limiting reactant in a chemical reaction, one must know the

• amount of product formed

• available amount of one of the reactants

• available amount of each of each reactant

• speed of the reaction

What is a limiting reactant?

• the reactant that determines how much product can be made

• the reactant that is in excess

• the product that you can make the most of

• the amount of reactants that react with each other

P₄ + 3O₂ --> P₄O₆ 
What is the limiting reactant is 12 moles of P₄ react with 15 moles of O₂?

• P₄

• O₂

• P₄O₆ 

• none of the above

When does a chemical reaction stop?

• When the lab is finished

• When the excess reactant is used up

• When the limiting reactant is used up

• Chemical reactions never stop

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃.  If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

• AlCl3

• Cl2

• Al

Tags

NGSS.HS-PS1-7

4NH₃ + 5O₂ --> 4NO + 6H₂O
How many grams of NO are formed if 6.30g of ammonia react with 1.80g of oxygen? 

• 0.37g

• 0.045g

• 1.35g

• 11.1g

Tags

NGSS.HS-PS1-7

In a chemical reaction, the reactant that is completely consumed and limits the amount of product formed is known as the:

• A) Catalyst

• B) Limiting reactant

• C) Excess reactant

• D) Intermediate

Which of the following statements is true about a limiting reactant in a chemical reaction?

• A) It is always present in the largest amount.

• B) It determines the maximum amount of product that can be formed.

• C) It is never completely consumed.

• D) It speeds up the reaction.

• D) None of the above