Limiting Reactants and Stoichiometry Quiz

The diagram below represents H₂ and Cl₂ molecules that will potentially react to form HCl. Which of the following best describes this reaction?

• The limiting reactant is chlorine.

• The limiting reactant is hydrogen.

• Hydrogen and chlorine are nonreactive.

• All molecules shown will react to form the product. 

• H₂

• I₂

• HI

Identify the limiting and excess reactants in the reaction shown.

• N₂ is limiting and H₂ is excess. 

• H₂ is limiting and N₂ is excess. 

• NH₃ is both limiting and excess.

• There is no limiting reactant. 

Hydrogen and oxygen molecules combine to form water molecules as shown in the reaction below. Given the molecules provided, which of the following is true about the products of this reaction? 

• 2 H₂O molecules are produced, O₂ is the limiting reactant

• 4 H₂O molecules are produced, H₂ is the limiting reactant

• 4 H₂O molecules are produced, O₂ is the limiting reactant

• 6 H₂O molecules are produced, H₂ is the limiting reactant

• None, they are in perfect stoichiometric ratio

• 2 moles

• 4 moles

• 6 moles

• 8 moles

• 3 moles

• 6 moles

• 9 moles

• 12 moles

Which of the following statements is true about excess reactants?

• Excess reactants are completely consumed in a reaction.

• Excess reactants determine the amount of product formed.

• Excess reactants are left over after the reaction is complete.

• Excess reactants are the same as limiting reactants.

• 5 moles

• 10 moles

• 15 moles

• 20 moles

If the actual yield of a reaction is 8 grams and the theoretical yield is 10 grams, what is the percent yield?

• 60%

• 70%

• 80%

• 90%