Gce Model Questions Vol1 2022 Chemistry Question 22

Practice objective / multiple choice question 22 from the 2022 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2022 Chemistry Objective / Multiple Choice Hard Difficulty
Question 22 GCE_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • objective

Ethanoic acid \(\mathrm{CH_3COOH}\) reacts with ethanol \(\mathrm{C_2H_5OH}\) to give ethyl acetate \(\mathrm{CH_3COOC_2H_5}\) and water. At 25 °C the equilibrium constant is \(K_c = 4.0\). In a 1.00 L flask 0.500 mol of each reactant are mixed. (a) Determine the equilibrium concentrations of all species. (b) The reaction enthalpy is \(\Delta H^{\circ}=+8.0\ \text{kJ mol}^{-1}\). Estimate the new equilibrium constant at 35 °C using the van't Hoff equation (assume \(\Delta H^{\circ}\) is constant). (c) Using the new \(K_c\) value, calculate the equilibrium concentration of ethyl acetate at 35 °C.

Answer Options

A. 0.180 M CH₃COOH, 0.180 M C₂H₅OH, 0.320 M CH₃COOC₂H₅, 0.320 M H₂O; Kc(35°C)≈4.60; [CH₃COOC₂H₅]≈0.330 M
B. 0.160 M CH₃COOH, 0.160 M C₂H₅OH, 0.340 M CH₃COOC₂H₅, 0.340 M H₂O; Kc(35°C)≈4.80; [CH₃COOC₂H₅]≈0.345 M
C. 0.150 M CH₃COOH, 0.150 M C₂H₅OH, 0.350 M CH₃COOC₂H₅, 0.350 M H₂O; Kc(35°C)≈4.20; [CH₃COOC₂H₅]≈0.350 M
Correct Answer D. 0.167 M CH₃COOH, 0.167 M C₂H₅OH, 0.333 M CH₃COOC₂H₅, 0.333 M H₂O; Kc(35 °C)≈4.44; [CH₃COOC₂H₅]≈0.339 M
Correct Answer
D
Correct Option:
0.167 M CH₃COOH, 0.167 M C₂H₅OH, 0.333 M CH₃COOC₂H₅, 0.333 M H₂O; Kc(35 °C)≈4.44; [CH₃COOC₂H₅]≈0.339 M

About This Question

This is Gce Model Questions Vol1 2022 Chemistry Question 22. It is one of the objective questions from the 2022 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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