Neco Model Questions Vol1 2017 Chemistry Question 10

Practice objective / multiple choice question 10 from the 2017 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2017 Chemistry Objective / Multiple Choice Hard Difficulty
Question 10 NECO_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • objective

A student carries out the Fischer esterification of acetic acid with ethanol to produce ethyl acetate: CH_{3}COOH + C_{2}H_{5}OH \rightleftharpoons CH_{3}COOC_{2}H_{5} + H_{2}O. The amounts used are 0.050\,mol of acetic acid and 0.060\,mol of ethanol, together with 5\,mL of 0.10\,M H_{2}SO_{4} as catalyst. After refluxing for 2\,h, the reaction reaches equilibrium and 70\% of the theoretical maximum amount of ethyl acetate is obtained. (a) Calculate the mass of ethyl acetate formed (M = 88.1\,g·mol^{-1}). (b) The crude product is washed with 0.150\,L of 0.10\,M NaOH solution to neutralise any unreacted acetic acid. How many moles of NaOH are consumed in this washing step? (c) Determine the overall percent yield of ethyl acetate based on the limiting reactant.

Answer Options

A. a) 2.45 g; b) 0.012 mol NaOH; c) 55 % yield
B. a) 2.90 g; b) 0.010 mol NaOH; c) 65 % yield
Correct Answer C. a) 3.08 g; b) 0.015 mol NaOH; c) 70 % yield
D. a) 3.50 g; b) 0.018 mol NaOH; c) 80 % yield
Correct Answer
C
Correct Option:
a) 3.08 g; b) 0.015 mol NaOH; c) 70 % yield

About This Question

This is Neco Model Questions Vol1 2017 Chemistry Question 10. It is one of the objective questions from the 2017 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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