Gce Model Questions Vol1 2022 Chemistry Question 3

Practice objective / multiple choice question 3 from the 2022 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2022 Chemistry Objective / Multiple Choice Hard Difficulty
Question 3 GCE_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • objective

A hydrocarbon containing only carbon and hydrogen is completely combusted, producing 44.8 g of \(CO_2\) and 18.0 g of \(H_2O\). The hydrocarbon has a molar mass of 58.1 g mol⁻¹. (a) Determine its molecular formula, assuming it is an alkene. (b) Using the average bond enthalpies (kJ mol⁻¹): C=C 614, C-C 348, C-H 413, O=O 498, C=O (in \(CO_2\)) 799, O-H (in \(H_2O\)) 463, calculate the standard enthalpy change for its combustion.

Answer Options

A. Molecular formula: C₄H₁₀; \(\Delta H_{comb} = -2.05\times10^{3}\) kJ mol⁻¹ (≈ -2050 kJ mol⁻¹)
B. Molecular formula: C₅H₁₀; \(\Delta H_{comb} = -2.30\times10^{3}\) kJ mol⁻¹ (≈ -2300 kJ mol⁻¹)
Correct Answer C. Molecular formula: C₄H₈; \(\Delta H_{comb} = -2.15\times10^{3}\) kJ mol⁻¹ (≈ -2146 kJ mol⁻¹)
D. Molecular formula: C₃H₆; \(\Delta H_{comb} = -1.95\times10^{3}\) kJ mol⁻¹ (≈ -1950 kJ mol⁻¹)
Correct Answer
C
Correct Option:
Molecular formula: C₄H₈; \(\Delta H_{comb} = -2.15\times10^{3}\) kJ mol⁻¹ (≈ -2146 kJ mol⁻¹)

About This Question

This is Gce Model Questions Vol1 2022 Chemistry Question 3. It is one of the objective questions from the 2022 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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