GENERAL CHEMISTRY LAB EXAM II QUESTION BANK: 200
MASTER QUESTIONS (2026/2027)
SECTION 1: STOICHIOMETRY AND PERCENT YIELD (Questions 1-50)
Q1. What is the definition of theoretical yield in a chemical reaction?
• Single Choice:
(A) The amount of product actually obtained
(B) The maximum amount of product that can be generated from
the limiting reactant
(C) The amount of reactant consumed
(D) The mass of the catalyst used
Q2. The formula to calculate percent yield is (actual yield / theoretical
yield) multiplied by ______.
• Fill in the Blanks:
Answer: 100
Q3. 0.980 g of acetylsalicylic acid was obtained from 1.00 g of salicylic
acid by reaction with excess acetic anhydride. Calculate the percent
yield.
, • Single Choice:
(A) 75.2%
(B) 75.2%
(C) 80.0%
(D) 98.0%
Q4. List three reasons why the actual yield of a chemical reaction
might be less than the theoretical yield.
• List:
Answer:
1. Side reactions occurring
2. Loss of product during transfer or filtration
3. Reversible reactions not going to completion
Q5. In the reaction to synthesize aspirin, 1 mole of salicylic acid
(MW=138.12g) reacts with excess acetic anhydride to produce 1 mole
of aspirin (MW=180.15g). What is the theoretical yield if you start
with 2.00g of salicylic acid?
• Multiple Choice:
(A) 1.50g
(B) 2.00g
, (C) 2.61g
(D) 3.60g
Q6. The molar mass of salicylic acid is 138.12 g/mol.
• Fill in the Blanks:
Answer: 138.12
Q7. If the theoretical yield of a reaction is 1.303g and the actual yield
is 0.980g, what is the percent yield?
• Single Choice:
(A) 75.2%
(B) 75.2%
(C) 133.0%
(D) 1.33%
Q8. Define actual yield.
• List:
Answer: Actual yield is the amount of product actually produced
by a chemical reaction (measured experimentally).
Q9. Limiting reactant is the reactant that limits the amount of product
formed.
• Fill in the Blanks:
Answer: limiting reactant
, Q10. Excess reagent is completely consumed in a chemical reaction.
True or False?
• Single Choice:
(A) True
(B) False
Q11. Calculate the theoretical yield of aspirin (MW=180.15g) if 1.00g
of salicylic acid (MW=138.12g) is used.
• Single Choice:
(A) 1.303g
(B) 1.303g
(C) 1.500g
(D) 0.980g
Q12. What is the mole ratio between salicylic acid and acetylsalicylic
acid in the synthesis of aspirin?
• Fill in the Blanks:
Answer: 1:1
Q13. If 2.00g of salicylic acid produces 1.50g of aspirin, what is the
percent yield?
• Single Choice:
(A) 75%
MASTER QUESTIONS (2026/2027)
SECTION 1: STOICHIOMETRY AND PERCENT YIELD (Questions 1-50)
Q1. What is the definition of theoretical yield in a chemical reaction?
• Single Choice:
(A) The amount of product actually obtained
(B) The maximum amount of product that can be generated from
the limiting reactant
(C) The amount of reactant consumed
(D) The mass of the catalyst used
Q2. The formula to calculate percent yield is (actual yield / theoretical
yield) multiplied by ______.
• Fill in the Blanks:
Answer: 100
Q3. 0.980 g of acetylsalicylic acid was obtained from 1.00 g of salicylic
acid by reaction with excess acetic anhydride. Calculate the percent
yield.
, • Single Choice:
(A) 75.2%
(B) 75.2%
(C) 80.0%
(D) 98.0%
Q4. List three reasons why the actual yield of a chemical reaction
might be less than the theoretical yield.
• List:
Answer:
1. Side reactions occurring
2. Loss of product during transfer or filtration
3. Reversible reactions not going to completion
Q5. In the reaction to synthesize aspirin, 1 mole of salicylic acid
(MW=138.12g) reacts with excess acetic anhydride to produce 1 mole
of aspirin (MW=180.15g). What is the theoretical yield if you start
with 2.00g of salicylic acid?
• Multiple Choice:
(A) 1.50g
(B) 2.00g
, (C) 2.61g
(D) 3.60g
Q6. The molar mass of salicylic acid is 138.12 g/mol.
• Fill in the Blanks:
Answer: 138.12
Q7. If the theoretical yield of a reaction is 1.303g and the actual yield
is 0.980g, what is the percent yield?
• Single Choice:
(A) 75.2%
(B) 75.2%
(C) 133.0%
(D) 1.33%
Q8. Define actual yield.
• List:
Answer: Actual yield is the amount of product actually produced
by a chemical reaction (measured experimentally).
Q9. Limiting reactant is the reactant that limits the amount of product
formed.
• Fill in the Blanks:
Answer: limiting reactant
, Q10. Excess reagent is completely consumed in a chemical reaction.
True or False?
• Single Choice:
(A) True
(B) False
Q11. Calculate the theoretical yield of aspirin (MW=180.15g) if 1.00g
of salicylic acid (MW=138.12g) is used.
• Single Choice:
(A) 1.303g
(B) 1.303g
(C) 1.500g
(D) 0.980g
Q12. What is the mole ratio between salicylic acid and acetylsalicylic
acid in the synthesis of aspirin?
• Fill in the Blanks:
Answer: 1:1
Q13. If 2.00g of salicylic acid produces 1.50g of aspirin, what is the
percent yield?
• Single Choice:
(A) 75%
