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Edexcel A-Level Chemistry AS 6.9 The Terms Bond Enthalpy and Mean Bond Enthalpy Questions

Use marked Edexcel IAL Chemistry questions to define mean bond enthalpy, calculate reaction enthalpies from bonds broken and made, and evaluate limitations against standard data.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Define mean bond enthalpy as the average gas-phase enthalpy for homolytic bond breaking.
  • Calculate reaction enthalpy from bond enthalpies for bonds broken and made.
  • Evaluate limitations of mean bond enthalpies and relate bond types and numbers to reaction enthalpy.

Edexcel A-Level Chemistry AS 6.9 The Terms Bond Enthalpy and Mean Bond Enthalpy Questions question 1

[Maximum number: 1]

Consider the bond enthalpy values given in the table.

The equation for the reaction between nitrogen and hydrogen is shown.
N₂(g) + 3H₂(g) → 2NH₃(g)

What is the enthalpy change, in kJ mol⁻¹, for this reaction?

Figure for Question Edexcel A-Level Chemistry AS 6.9 The Terms Bond Enthalpy and Mean Bond Enthalpy Questions question 1 — Edexcel A-Level Chemistry AS
A

+1080

B

+852

C

−93

D

−529

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