Neco Model Questions Vol1 2024 Chemistry Question 40

Practice objective / multiple choice question 40 from the 2024 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2024 Chemistry Objective / Multiple Choice Hard Difficulty
Question 40 NECO_MODEL_QUESTIONS_VOL1 • 2024 • CHEMISTRY • objective

Ethanol reacts with acetic acid to form ethyl acetate and water. At 25 °C the equilibrium constant \(K_c\) for the reaction \(\mathrm{CH_3COOH + CH_3CH_2OH \rightleftharpoons CH_3COOCH_2CH_3 + H_2O}\) is 4.0. A 1.0 L flask initially contains 0.50 mol of acetic acid and 0.80 mol of ethanol, with no ester or water present. (a) Calculate the equilibrium concentrations of all species. (b) What percentage of the initial acetic acid is converted to ester at equilibrium?

Answer Options

A. Equilibrium concentrations: [CH₃COOH]=0.30 M, [CH₃CH₂OH]=0.50 M, [CH₃COOCH₂CH₃]=0.20 M, [H₂O]=0.20 M; 60 % conversion of acetic acid.
B. Equilibrium concentrations: [CH₃COOH]=0.20 M, [CH₃CH₂OH]=0.60 M, [CH₃COOCH₂CH₃]=0.20 M, [H₂O]=0.20 M; 40 % conversion of acetic acid.
C. Equilibrium concentrations: [CH₃COOH]=0.05 M, [CH₃CH₂OH]=0.45 M, [CH₃COOCH₂CH₃]=0.45 M, [H₂O]=0.45 M; 90 % conversion of acetic acid.
Correct Answer D. Equilibrium concentrations: [CH₃COOH]=0.10 M, [CH₃CH₂OH]=0.40 M, [CH₃COOCH₂CH₃]=0.40 M, [H₂O]=0.40 M; 80 % conversion of acetic acid.
Correct Answer
D
Correct Option:
Equilibrium concentrations: [CH₃COOH]=0.10 M, [CH₃CH₂OH]=0.40 M, [CH₃COOCH₂CH₃]=0.40 M, [H₂O]=0.40 M; 80 % conversion of acetic acid.

About This Question

This is Neco Model Questions Vol1 2024 Chemistry Question 40. It is one of the objective questions from the 2024 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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