February/March 2026 Paper 22

2026 · 40 questions · 40 parts · 40 marks

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13Enthalpy Cycles Bond EnthalpiesMedium1 mark
Hydrogen peroxide, H–O–O–H, decomposes to form water and oxygen.
The bond energies are shown in the table. The reaction is exothermic.
bondbond energy in kJ / mol
O–H
O–O
What is the enthalpy change for this reaction?