Waec Model Questions Vol1 2021 Chemistry Question 11

Practice objective / multiple choice question 11 from the 2021 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2021 Chemistry Objective / Multiple Choice Hard Difficulty
Question 11 WAEC_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • objective

A 2.00 g sample of an unknown straight‑chain alkane is burnt completely in excess oxygen. The combustion yields 6.12 g of carbon dioxide and 3.00 g of water. (a) Determine the empirical formula of the alkane. (b) Given that the molar mass of the alkane is 72 g·mol⁻¹, deduce its molecular formula and write its IUPAC name.

Answer Options

A. Empirical formula C₄H₁₀; molecular formula C₈H₁₈; IUPAC name octane
B. Empirical formula C₅H₁₀; molecular formula C₁₀H₂₀; IUPAC name decane
Correct Answer C. Empirical formula C₅H₁₂; molecular formula C₅H₁₂; IUPAC name pentane
D. Empirical formula C₆H₁₄; molecular formula C₆H₁₄; IUPAC name hexane
Correct Answer
C
Correct Option:
Empirical formula C₅H₁₂; molecular formula C₅H₁₂; IUPAC name pentane

About This Question

This is Waec Model Questions Vol1 2021 Chemistry Question 11. It is a objective / multiple choice question from the 2021 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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