Stoichiometry & 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

What is the theoretical yield of water if 8 moles of NH₃ react with 6 moles of NO?

4NH₃+6NO --> 5N₂ + 6H₂O

• 5 moles

• 6 moles

• 12 moles

• 18 moles

Tags

NGSS.HS-PS1-7

In a balanced equation, the ratio between the coefficient of any two substances is called the _______.

• mole ratio

• stoichiometry

• limiting reactant

• excess 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-PS1-7

Theoretical yield = 73g

Actual yield = 62g

Calculate the percent yield.

• 18%

• 118%

• 85%

• 15%

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

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

Tags

NGSS.HS-PS1-7

What is the actual yield?

• the maximum amount of product from a reaction

• the amount of product recovered from a lab experiment

• amount of product that causes the reaction to stop

• the amount of product needed to reverse the reaction

Tags

NGSS.HS-PS1-6

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

Tags

NGSS.HS-PS1-7