O-LevelChemistryRates of Reaction5070/11 · May/June 2024 · Q151 Mark

Hydrogen reacts with oxygen to produce water. H-H H-H + O=O → H-O-H H-O-H Some bond energies are shown. bond bond energy in kJ/mol H-H 436 O-O 146 O=O 496 O-H 463 Using the data in the table, what is the enthalpy change of reaction?

A-920 kJ/mol

B-834 kJ/mol

C-484 kJ/mol

D+442 kJ/mol

✓ Correct answer

C: -484 kJ/mol

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2024 Paper 1 Variant 1, question 15.

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