Waec Model Questions Vol1 2017 Chemistry Question 18

Practice objective / multiple choice question 18 from the 2017 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2017 Chemistry Objective / Multiple Choice Hard Difficulty
Question 18 WAEC_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • objective

A reaction between benzoic acid (C₇H₆O₂) and ethanol (C₂H₅OH) is carried out. The masses used are 10.0 g of benzoic acid and 5.0 g of ethanol. The reaction is: C₇H₆O₂ + C₂H₅OH → C₉H₁₀O₂ + H₂O. After completion, 6.5 g of ethyl benzoate (C₉H₁₀O₂) is isolated. Determine (a) the limiting reagent, (b) the theoretical mass of ethyl benzoate, (c) the percent yield based on the 6.5 g obtained, and (d) the theoretical mass of water that would be formed.

Answer Options

Correct Answer A. Limiting reagent: benzoic acid; Theoretical mass of ethyl benzoate: 12.3 g; Percent yield: 53 %; Theoretical water mass: 1.48 g
B. Limiting reagent: benzoic acid; Theoretical mass of ethyl benzoate: 13.5 g; Percent yield: 60 %; Theoretical water mass: 1.80 g
C. Limiting reagent: ethanol; Theoretical mass of ethyl benzoate: 12.8 g; Percent yield: 50 %; Theoretical water mass: 1.30 g
D. Limiting reagent: ethanol; Theoretical mass of ethyl benzoate: 11.0 g; Percent yield: 45 %; Theoretical water mass: 1.20 g
Correct Answer
A
Correct Option:
Limiting reagent: benzoic acid; Theoretical mass of ethyl benzoate: 12.3 g; Percent yield: 53 %; Theoretical water mass: 1.48 g

About This Question

This is Waec Model Questions Vol1 2017 Chemistry Question 18. It is one of the objective questions from the 2017 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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