February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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9Enthalpy Cycles Bond EnthalpiesHard1 mark
The diagram shows an energy cycle with a series of reactions.
an enthalpy energy-cycle diagram with five labelled arrows linking five levels: C(s) + 1.5O2(g) + H2(g) at the top; arrow 1 down to HCOOH(l) + 0.5O2(g) and arrow 2 down to CO(g) + H2(g) + O2(g); arrow 3 from HCOOH(l) + 0.5O2(g) down to CO2(g) + H2O(l); arrow 4 from CO(g) + H2(g) + O2(g) down to CO2(g) + H2(g) + 0.5O2(g); and arrow 5 from CO2(g) + H2(g) + 0.5O2(g) down to CO2(g) + H2O(l)
Which reactions have an enthalpy change that is an enthalpy of formation?