February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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8Enthalpy Cycles Bond EnthalpiesMedium1 mark
The equation for the formation of ammonia is shown.
Some bond energy data is given.
Bond energies
bondbond energy / kJ mol
H–H436
N–H388
What is the bond energy of the NN bond in the nitrogen molecule?