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

Difficulty level: Hard .

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