Limiting Reactant Definition

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃.  If 4 moles of aluminum and 4 moles of chlorine are reacted, identify the limiting reactant.

• AlCl₃

• Cl₂

• Al

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

The limiting reactant

• slows the reaction down
• is used up first
• is the reactant that is left over
• controls the speed of the reaction

What is the limiting reactant if 12 moles of NH₃  react with 30.0 moles of NO?

4NH₃+6NO → 5N₂ + 6 H₂O

• NH₃

• NO

• N₂

• H₂O

When 12 moles of O₂ reacts with 2.0 mole of C₁₀H₈ what is the limiting reactant?

 

C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

• O₂

• C₁₀H₈

• H₂O

• CO₂

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

You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich.  If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?

• bread
• jelly
• peanut butter
• sandwich

How much water can be made if 8 moles of NH₃ react with 6 moles of NO?

4NH₃+6NO --> 5N₂ + 6H₂O

• 5 moles

• 6 moles

• 12 moles

• 18 moles

1 Cheese + 2 Bread --> 1 Grilled cheese
How many grilled cheeses can you make with 26 slices of bread and 14 pieces of cheese?

• 14
• 13
• 26
• 7

The reactant that is not completely used up (leftovers) in a chemical reaction is called the __________ .

• limiting reagent

• excess reagent