Waec Model Questions Vol1 2021 Chemistry Question 44

Practice objective / multiple choice question 44 from the 2021 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2021 Chemistry Objective / Multiple Choice Hard Difficulty
Question 44 WAEC_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • objective

A 0.74 g sample of an unknown monobasic carboxylic acid is dissolved in water and titrated with 0.100 M NaOH solution. The titration reaches the equivalence point after the addition of 100.0 mL of NaOH. (a) Calculate the molecular weight of the acid. (b) The acid is then esterified with excess ethanol in the presence of concentrated H₂SO₄, giving an ester that boils at 78.5 °C. Identify the acid.

Answer Options

Correct Answer A. Molar mass = 74 g·mol⁻¹; acid = propionic acid
B. Molar mass = 88 g·mol⁻¹; acid = butyric acid
C. Molar mass = 60 g·mol⁻¹; acid = acetic acid
D. Molar mass = 102 g·mol⁻¹; acid = valeric acid
Correct Answer
A
Correct Option:
Molar mass = 74 g·mol⁻¹; acid = propionic acid

About This Question

This is Waec Model Questions Vol1 2021 Chemistry Question 44. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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