Gce Model Questions Vol1 2025 Chemistry Question 2

Practice objective / multiple choice question 2 from the 2025 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2025 Chemistry Objective / Multiple Choice Hard Difficulty
Question 2 GCE_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • objective

Ethyl acetate is formed by the esterification of acetic acid with ethanol: \( \mathrm{CH_3COOH + C_2H_5OH \rightleftharpoons CH_3COOC_2H_5 + H_2O} \). In a 1.0 L flask, 0.10 mol of acetic acid and 0.15 mol of ethanol are mixed. The equilibrium constant at 25 °C is \( K_c = 4.0 \). Assuming the volume remains 1.0 L and that water is initially absent, calculate the equilibrium concentrations of all species and the percentage of the initial acetic acid that has been converted to ester.

Answer Options

Correct Answer A. [CH₃COOH] = 0.0215 M, [C₂H₅OH] = 0.0715 M, [CH₃COOC₂H₅] = 0.0785 M, [H₂O] = 0.0785 M; 78.5 % of the acid is converted.
B. [CH₃COOH] = 0.005 M, [C₂H₅OH] = 0.095 M, [CH₃COOC₂H₅] = 0.075 M, [H₂O] = 0.075 M; 95 % of the acid is converted.
C. [CH₃COOH] = 0.050 M, [C₂H₅OH] = 0.050 M, [CH₃COOC₂H₅] = 0.075 M, [H₂O] = 0.075 M; 50 % of the acid is converted.
D. [CH₃COOH] = 0.030 M, [C₂H₅OH] = 0.070 M, [CH₃COOC₂H₅] = 0.075 M, [H₂O] = 0.075 M; 75 % of the acid is converted.
Correct Answer
A
Correct Option:
[CH₃COOH] = 0.0215 M, [C₂H₅OH] = 0.0715 M, [CH₃COOC₂H₅] = 0.0785 M, [H₂O] = 0.0785 M; 78.5 % of the acid is converted.

About This Question

This is Gce Model Questions Vol1 2025 Chemistry Question 2. It is one of the objective questions from the 2025 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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