Igcse Model Questions Vol1 2024 Chemistry Question 9

Practice objective / multiple choice question 9 from the 2024 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2024 Chemistry Objective / Multiple Choice Medium Difficulty
Question 9 IGCSE_MODEL_QUESTIONS_VOL1 • 2024 • CHEMISTRY • objective

A 0.250 g sample of an unknown organic compound containing only C, H and O is combusted completely. The combustion yields 0.366 g of carbon dioxide and 0.150 g of water. (a) Determine the empirical formula of the compound. (b) If the molar mass of the compound is known to be 180 g·mol⁻¹, calculate the number of moles present in the original sample.

Answer Options

A. Empirical formula = CH₃O; moles in sample = 1.39×10⁻³ mol
B. Empirical formula = C₂H₄O; moles in sample = 2.78×10⁻³ mol
Correct Answer C. Empirical formula = CH₂O; moles in sample = 1.39×10⁻³ mol
D. Empirical formula = CH₂O; moles in sample = 2.00×10⁻³ mol
Correct Answer
C
Correct Option:
Empirical formula = CH₂O; moles in sample = 1.39×10⁻³ mol

About This Question

This is Igcse Model Questions Vol1 2024 Chemistry Question 9. It is one of the objective questions from the 2024 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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