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CAIE A-Level Chemistry AS 5.1.5 Bond Energies and Hr Questions

Practise using bond energies and Hessʼ Law cycles to calculate reaction enthalpy changes in CAIE 9701 AS questions with mark schemes.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Use bond energies and Hessʼ Law data to calculate and interpret reaction enthalpy changes.

CAIE A-Level Chemistry AS 5.1.5 Bond Energies and Hr Questions question 1

[Maximum number: 1]

Some bond energies are listed.

Table for Question CAIE A-Level Chemistry AS 5.1.5 Bond Energies and Hr Questions question 1 — CAIE A-Level Chemistry AS

One mole of hydrogen reacts with oxygen to give water vapour.

Using the bond energy data, what is the value for the enthalpy change of this reaction?

A

+221 kJ mol−1+221 \mathrm{~kJ} \mathrm{~mol}^{-1}

B

+6 kJ mol−1+6 \mathrm{~kJ} \mathrm{~mol}^{-1}

C

−242 kJ mol−1-242 \mathrm{~kJ} \mathrm{~mol}^{-1}

D

−417 kJ mol−1-417 \mathrm{~kJ} \mathrm{~mol}^{-1}

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