Chemical Reactions and Stoichiometry Quiz

Write and balance the chemical equation for the combustion of propane (C₃H₈) in oxygen.

• C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

• C₃H₈ + 4O₂ → 3CO₂ + 4H₂O

• C₃H₈ + 6O₂ → 3CO₂ + 4H₂O

• C₃H₈ + 5O₂ → 2CO₂ + 4H₂O

Identify the limiting reactant when 15.0 g of propane reacts with 40.0 g of oxygen.

• Propane

• Oxygen

• Both are limiting

• Neither is limiting

Calculate the percent yield if 25.5 g of CO₂ is actually collected.

• 85%

• 90%

• 95%

• 100%

How much excess reactant remains after the reaction?

• 5.0 g

• 10.0 g

• 15.0 g

• 20.0 g

What is the balanced chemical equation for the reaction of aluminum with hydrochloric acid to produce hydrogen gas and aluminum chloride?

• Al + HCl → AlCl + H₂

• 2Al + 6HCl → 2AlCl₃ + 3H₂

• Al + 3HCl → AlCl₃ + H₂

• 2Al + 3HCl → 2AlCl₃ + 3H₂

If 10.0 g of Al reacts with 25.0 g of HCl, which is the limiting reactant?

• Aluminum

• Hydrochloric acid

• Both are limiting

• Neither is limiting

What is the mass of hydrogen gas produced when 10.0 g of Al reacts with 25.0 g of HCl?

• 1.05 g

• 2.02 g

• 3.03 g

• 4.04 g

If only 1.85 g of H₂ is obtained, what is the percent yield?

• 85%

• 91.6%

• 92%

• 95%

How much excess reactant remains after the reaction?

• 5.0 g

• 10.0 g

• 15.0 g

• 20.0 g

Write and balance the chemical equation for the reaction of hydrogen gas with oxygen gas to form water.

• H₂ + O₂ → H₂O

• 2H₂ + O₂ → 2H₂O

• H₂ + 2O₂ → 2H₂O

• 2H₂ + 2O₂ → 2H₂O