C(s) + O2(g) → CO2(g) - enthalpy change of combustion, HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) - enthalpy change of neutralisation, C(s)→ C(g) - enthalpy change of atomisation, Na(s) + ½Cl2(g) → NaCl(s) - enthalpy change of formation, Na+(g) + Cl−(g) →NaCl(s) - lattice energy, Na+(g) + Cl−(g) →NaCl(aq) - enthalpy change of hydration, NaCl(s) → NaCl(aq) - enthalpy change of solution, Na(g) → Na+(g) + e- - ionisation energy (1st), Cl2(g) → 2Cl(g) - bond energy, Cl(g) + e- → Cl-(g)  - electron affinity (1st),

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