Limiting Reactant

What does a limiting reactant determine?

• How much product can actually be made

• Which reactant will have excess

• The maximum theoretical product that can be made

• How much excess reactant gets used

How do we decide which is the limiting reactant?

• The reactant which gives the most grams of product

• The reactant which gives the least grams of product

• The most product produced

• The least product produced

Place the steps of determining limiting reactant in order.

• Write both given grams of reactant

• Find the product to convert both into

• set up and calculate two gram to gram conversions

• Find the lower answer

• Write down the reactant which gave the lower answer as the limiting reactant

Tags

NGSS.HS-PS1-7

In the image, which reactant is limiting?

• The white molecules, because there are extra.

• The black atoms, because they are completely used up.

• The white molecules, because they are completely used up.

• The black atoms, because there are extra.

Tags

NGSS.HS-PS1-3

NGSS.HS-PS1-7

The limiting and excess reactant will be on the ​ (a)   side of the equation.

• Reactants

• Products

• left

• right

When determining the limiting reactant, we must convert the units into moles from grams and back to grams.

• True

• False

2 Al + 3 Cl₂ -> 2 AlCl₃ 

If 2 moles of aluminum and 2 moles of chlorine react, which is the limiting reactant?

• AlCl₃

• Cl₂

• Al

Tags

NGSS.HS-PS1-7

What is the limiting reactant if 10 moles of NH₃ reacts with 30 moles of NO?

• NH₃

• NO

• N₂

• water

What is the limiting reactant is 12 moles of P₄ react with 15 moles of O₂?

• P₄

• O₂

• P₄O₆ 

• none of the above

What is the role of a limiting reactant in a chemical reaction?

• It determines the amount of product formed

• It speeds up the reaction

• It increases the energy of the reaction

• It changes the state of reactants