Limiting Reactant Practice

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

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

When 12 moles of O₂ reacts with 1.1 mole of C₁₀H₈ what is the limiting reactant?  C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

• Oxygen
• C₁₀H₈
• Water
• Carbon Dioxide

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

• Fe
• S
• FeS
• none 

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

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

P₄ + 6Cl₂ --> 4PCl₃ 
The reaction of 75.0g P₄ with excess chlorine gas produces 110g PCl₃ in lab. Find the theoretical yield and calculate percent yield for the reaction. 

• 78%
• 64%
• 27%
• 33%

SO₂ + PCl₅ --> SOCl₂ + POCl₃

How much SOCl₂ is produced when 16.2g SO₂ react with 13.7g PCl_5?

• 7.83g

• 30.1g

• 26.4g

• 19.8g

SO₂ + PCl₅ --> SOCl₂ + POCl₃

How much excess reactant is left when 16.2g SO₂ reacts with 13.7g PCl_5?

• 12.0 g

• 4.22 g

• 16.2 g

• 2.5 g

• 0.0658 g

If you have 10.1 g KOH and 8.50 g H₃PO₄, how much excess reactant is left over after the reaction is complete?

Sig figs matter!

• 5.88 g

• 8.50 g

• 4.69 g

• 2.62 g

• 3.24 g