Waec Model Questions Vol1 2025 Chemistry Question 11

Practice objective / multiple choice question 11 from the 2025 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2025 Chemistry Objective / Multiple Choice Hard Difficulty
Question 11 WAEC_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • objective

A 20.0 g sample of an unknown hydrocarbon is combusted completely in excess oxygen, producing 66.0 g of CO₂ and 27.0 g of H₂O. The hydrocarbon is known to have a molar mass of 112 g·mol⁻¹. (a) Determine its empirical formula. (b) Write its molecular formula. (c) Calculate the volume of O₂ gas at STP required for the complete combustion of 1.00 mol of this hydrocarbon.

Answer Options

A. Empirical formula C₃H₆; molecular formula C₁₂H₂₄; O₂ volume = 3.00×10² L
B. Empirical formula C₂H₄; molecular formula C₁₀H₂₀; O₂ volume = 2.55×10² L
C. Empirical formula CH₃; molecular formula C₉H₁₈; O₂ volume = 2.80×10² L
Correct Answer D. Empirical formula CH₂; molecular formula C₈H₁₆; O₂ volume = 2.69×10² L
Correct Answer
D
Correct Option:
Empirical formula CH₂; molecular formula C₈H₁₆; O₂ volume = 2.69×10² L

About This Question

This is Waec Model Questions Vol1 2025 Chemistry Question 11. It is a objective / multiple choice question from the 2025 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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