Neco Model Questions Vol1 2020 Chemistry Question 14

Practice objective / multiple choice question 14 from the 2020 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2020 Chemistry Objective / Multiple Choice Hard Difficulty
Question 14 NECO_MODEL_QUESTIONS_VOL1 • 2020 • CHEMISTRY • objective

A 5.00 g sample of an unknown monobasic carboxylic acid with formula \(\text{C}_{n}\text{H}_{2n+1}\text{COOH}\) is dissolved in 50 mL water and titrated with 0.100 M NaOH. The equivalence point is reached after 42.5 mL of NaOH. The acid is then esterified with excess ethanol in the presence of H\(_2\)SO\(_4\) to give an ethyl ester. After purification, 0.520 g of the ester is obtained. (a) Determine the value of \(n\) and the molar mass of the acid. (b) Calculate the percent yield of the esterification.

Answer Options

A. n=5;\ M_{acid}\approx118\ \text{g mol}^{-1};\ %\,yield\approx60\%
B. n=4;\ M_{acid}\approx102\ \text{g mol}^{-1};\ %\,yield\approx70\%
Correct Answer C. n=5;\ M_{acid}\approx118\ \text{g mol}^{-1};\ %\,yield\approx85\%
D. n=6;\ M_{acid}\approx134\ \text{g mol}^{-1};\ %\,yield\approx92\%
Correct Answer
C
Correct Option:
n=5;\ M_{acid}\approx118\ \text{g mol}^{-1};\ %\,yield\approx85\%

About This Question

This is Neco Model Questions Vol1 2020 Chemistry Question 14. It is one of the objective questions from the 2020 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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