Excess Reactant Stoichiometry Worksheet

Excess Reactant Stoichiometry Worksheet

Read each question carefully and provide detailed answers. Show all your calculations and units.

1. In a chemical reaction, what is the difference between a limiting reactant and an excess reactant?

2. The reactant that determines the maximum amount of product that can be formed is called the   reactant.

3. The reactant that is left over after the reaction has gone to completion is called the   reactant.

4. Consider the reaction: 2H₂ (g) + O₂ (g) → 2H₂O (l). If you have 4 moles of H₂ and 3 moles of O₂, which is the limiting reactant?

5. Given the reaction: 2Al (s) + 3Cl₂ (g) → 2AlCl₃ (s)

If 10.0 g of aluminum (Al) reacts with 15.0 g of chlorine gas (Cl₂):

a. Determine the limiting reactant.

b. Calculate the theoretical yield of aluminum chloride (AlCl₃) in grams.

c. Calculate the mass (in grams) of the excess reactant remaining after the reaction is complete.

6. The theoretical yield of a reaction is always determined by the excess reactant.