3. Stoichiometry
Limiting Reactants — Quiz
Test your understanding of limiting reactants with 5 practice questions.
Practice Questions
Question 1
A reaction between 4.0 moles of hydrogen gas (H₂) and 2.0 moles of oxygen gas (O₂) produces water (H₂O). According to the balanced equation, which reactant is the limiting reactant?
Question 2
In a reaction where 5.0 moles of nitrogen (N₂) react with 12.0 moles of hydrogen (H₂) to form ammonia (NH₃), how many moles of ammonia can be formed if nitrogen is the limiting reactant? The balanced equation is: $$N_2 + 3H_2 \rightarrow 2NH_3.$$
Question 3
A mixture of 3.0 moles of aluminum (Al) and 5.0 moles of chlorine gas (Cl₂) reacts to form aluminum chloride (AlCl₃). The balanced equation is: $2Al + 3Cl_2 \rightarrow 2AlCl_3.$ What is the limiting reactant in this reaction?
Question 4
A chemist combines 2.5 moles of sulfur (S₈) with 24.0 moles of fluorine gas (F₂) to form sulfur hexafluoride (SF₆). The balanced equation is: $S_8 + 24F_2 \rightarrow 8SF_6.$ How many moles of SF₆ are produced, and which reactant is in excess?
Question 5
In a reaction, 0.75 moles of magnesium (Mg) and 1.5 moles of hydrochloric acid (HCl) react to form magnesium chloride (MgCl₂) and hydrogen gas (H₂). The balanced equation is: $Mg + 2HCl \rightarrow MgCl_2 + H_2.$ How many moles of hydrogen gas (H₂) are produced?