Y12 Chem Chapter 3: STOICHIOMETRY PRACTICE
Question 1
If 25.0 mL of a 0.329 M solution of vinegar is mixed with 1.23 g of baking soda,
a. Which is the limiting reactant? What is the theoretical yield of carbon dioxide?
b. How much of the excess reactant remains after the reaction is complete?
c. The volume of the remaining solution to be 26.3 mL. What is the concentration of the
NaHCO3 that remains in the solution?
Question 2
The zinc core of a penny can be dissolved in hydrochloric acid.
If a penny that contains 2.015 g of zinc is placed in 20.0 mL of a 6.00 M hydrochloric acid
solution,
a. Will the zinc in the penny dissolve completely? What is the limiting reagent?
b. How much excess reactant is present?
Y12 Chem Chapter 3: STOICHIOMETRY PRACTICE
Question 3
1.00 mL of a 0.125 M potassium iodide solution is mixed with 2.00 mL of a 0.0215 M
mercury (I) nitrate solution. Assuming the reaction goes to completion, what is the excess
reactant, and what is its concentration in the final solution?
Question 4
A solution containing 5.00 g of lead (II) acetate is mixed with a solution containing 3.00 g of
ammonium iodide.
a. What is the limiting reactant for the above reaction?
b. Assuming the reaction occurred in a 1.0 L solution, what is the final concentration of
the excess reactant?
Y12 Chem Chapter 3: STOICHIOMETRY PRACTICE
Question 5
Zinc chloride (0.55 M, 50.0 mL) reacts with ammonium phosphate (0.75 M, 55.0 mL) to
completion.
a. What mass of zinc phosphate is produced?
b. Assuming the volumes are additive, what is the final concentration of ammonium
chloride?
c. What is the excess reactant, and what is its final concentration?
Y12 Chem Chapter 3: STOICHIOMETRY PRACTICE
Question 6
Consider the reaction between silicon dioxide and carbon:
a. 10.45 g of silicon dioxide is mixed with 4.21 g of carbon. What is the limiting
reactant? Calculate the theoretical yield for SiC.
b. If the reaction goes to completion, how many grams of SiO2, C, SiC and CO are
present after the reaction is complete?
Y12 Chem Chapter 3: STOICHIOMETRY PRACTICE
Challenge Problems
For the following problems, first write the chemical reaction.
Challenge 1
Antacids are used to neutralize the stomach acid and decrease acid reflux. If Dave’s stomach
contains 150 mL of 0.164 M hydrochloric acid, will two antacid tablets (each containing 500.
mg of calcium carbonate) neutralize all of the acid? How much excess reactant will remain?
Y12 Chem Chapter 3: STOICHIOMETRY PRACTICE
Challenge 2
A solution of potassium hydroxide (0.540 M, 50.0 mL) is mixed with iron (III) chloride
(0.0265 M, 100.0 mL). How much of each product is formed if the reaction goes to
completion? What is the excess reactant, and what is its concentration at the end of the
reaction?