Waec Model Questions Vol1 2022 Chemistry Question 47

Practice objective / multiple choice question 47 from the 2022 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2022 Chemistry Objective / Multiple Choice Hard Difficulty
Question 47 WAEC_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • objective

A 4.00 g sample of an unknown monohydric alcohol is combusted completely, giving 7.64 g of CO₂ and 4.69 g of H₂O. (i) Determine the molecular formula of the alcohol. (ii) The alcohol then reacts with excess PCl₅ according to R‑OH + PCl₅ → R‑Cl + POCl₃ + HCl. Calculate the mass of PCl₅ required for complete conversion of the 4.00 g sample.

Answer Options

A. Molecular formula: C₂H₆O; PCl₅ required = 20.3 g
B. Molecular formula: C₃H₈O; PCl₅ required = 22.5 g
Correct Answer C. Molecular formula: C₂H₆O; PCl₅ required = 18.1 g
D. Molecular formula: C₂H₄O; PCl₅ required = 15.2 g
Correct Answer
C
Correct Option:
Molecular formula: C₂H₆O; PCl₅ required = 18.1 g

About This Question

This is Waec Model Questions Vol1 2022 Chemistry Question 47. It is one of the objective questions from the 2022 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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