Born-Haber Cycle for Sodium Oxide

OCR A-level ChemistryLattice EnthalpyLesson 7 of 10

The standard enthalpy of formation of sodium oxide is -414kJmol^-1. The equation is:

2Na(s) + ½O₂(g) → Na₂O(s)

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standard enthalpy change of formation: The enthalpy change when one mole of a compound is formed from its constituent elements in their standard states, under standard conditions.
standard enthalpy change of atomisation: The enthalpy change when one mole of gaseous atoms is formed from an element in its standard state, under standard conditions.
first ionisation energy: The enthalpy change when one electron is removed from each atom in one mole of gaseous atoms, forming one mole of gaseous 1+ ions, under standard conditions.
first electron affinity: The enthalpy change when one electron is added to each atom in one mole of gaseous atoms, forming one mole of gaseous 1- ions, under standard conditions.
lattice enthalpy: The enthalpy change when one mole of an ionic compound is formed from its constituent gaseous ions, under standard conditions.