May/June 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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9Enthalpy Cycles Bond EnthalpiesMedium1 mark
An energy cycle is shown.
Energy cycle triangle: $\mathrm{NO(g)} + 0.5\mathrm{O_2(g)}$, top left, joined by a horizontal arrow labelled $\Delta H_1$ to $\mathrm{NO_2(g)}$, top right; $0.5\mathrm{N_2(g)} + \mathrm{O_2(g)}$, bottom centre, joined by an arrow labelled $\Delta H_2$ up to $\mathrm{NO(g)} + 0.5\mathrm{O_2(g)}$ and by a second arrow labelled $\Delta H_3$ up to $\mathrm{NO_2(g)}$.
Which expression equals the enthalpy change of formation of NO?