Limiting Reactant

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

Tags

NGSS.HS-PS1-7

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

The limiting reactant

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

Fe + S --> FeS
If 7.62g Fe react with 8.67g S, what is the limiting reactant?

• Fe
• S
• FeS
• none 

Tags

NGSS.HS-PS1-7

What is the limiting reactant if 10 moles of NH₃  react  with 30.0 moles of NO?
4NH₃+6NO --> 5N₂ + 6H₂O

• NH₃
• NO
• N₂
• water

Tags

NGSS.HS-PS1-7

Why is it important to identify the limiting reactant?

• The limiting reactant speeds up the reaction.

• The limiting reactant controls the amount of product formed.

• If there is no limiting reactant, the reaction will not occur.

• No stoichiometry calculations can be done without a limiting reactant.

Tags

NGSS.HS-PS1-7

Using the diagram, determine the limiting reactant, the product formed is water.

• oxygen

• hydrogen

• none of the reactant are limiting

• both hydrogen and oxygen

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

3CaCO₃ + 2FePO₄ --> Ca₃(PO₄)₂ + Fe₂(CO₃)₃

Assuming we start with 40.5 g of CaCO₃ and 45 g of FePO₄, identify the limiting reactant.

• iron(V) phosphate

• calcium carbonate

• iron(III) phosphate

• calcium(II) carbonate

Tags

NGSS.HS-PS1-7

CuCl₂ + 2NaNO₃ --> Cu(NO₃)₂ + 2NaCl

If 15.0 grams of CuCl₂ react with 20 g of NaNO₃, how much NaCl can be formed?

• 13.0 g of NaCl

• 98 g of NaCl

• 26 g of NaCl

• 17.4 of NaCl

Tags

NGSS.HS-PS1-7