Igcse Model Questions Vol1 2023 Chemistry Question 17

Practice objective / multiple choice question 17 from the 2023 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2023 Chemistry Objective / Multiple Choice Hard Difficulty
Question 17 IGCSE_MODEL_QUESTIONS_VOL1 • 2023 • CHEMISTRY • objective

Using the following bond dissociation energies (kJ mol^{-1}):\n\(\text{H-H}=436\), \(\text{Cl-Cl}=243\), \(\text{F-F}=158\), \(\text{H-Cl}=431\), \(\text{H-F}=565\).\n\n(a) Calculate the enthalpy change (\(\Delta H\)) for the reactions:\n(i) \(\text{H}_2(g)+\text{Cl}_2(g)\rightarrow 2\text{HCl}(g)\)\n(ii) \(\text{H}_2(g)+\text{F}_2(g)\rightarrow 2\text{HF}(g)\)\n\n(b) For each reaction, determine the amount of energy released per gram of halogen (Cl_{2} or F_{2}) consumed. Which halogen releases more energy per gram when reacting with hydrogen?

Answer Options

A. Fluorine releases more energy per gram (≈10 kJ g^{-1} vs 2.8 kJ g^{-1})
B. Fluorine releases more energy per gram (≈12 kJ g^{-1} vs 3.0 kJ g^{-1})
Correct Answer C. Fluorine releases more energy per gram (≈14 kJ g^{-1} vs 2.6 kJ g^{-1})
D. Chlorine releases more energy per gram (≈14 kJ g^{-1} vs 2.6 kJ g^{-1})
Correct Answer
C
Correct Option:
Fluorine releases more energy per gram (≈14 kJ g^{-1} vs 2.6 kJ g^{-1})

About This Question

This is Igcse Model Questions Vol1 2023 Chemistry Question 17. It is one of the objective questions from the 2023 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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