Standard enthalpy definitions

Lattice emthalpy

The enthalpy change that accompanies the formation of one mole of an ionic compound from its gaseous ions under standard conditions.

Standard enthalpy change of formation

The enthalpy change when one mole of a compound is formed from its constituent elements under standard conditions with all reactants and products in their standard states

Standard enthalpy change of atomisation

The enthalpy change that takes place for the formation of one mole of gaseous atoms from the element in its standard state under standard conditions

First ionisation energy

The enthalpy change required to remove one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions

First electron affinity

The enthalpy change that takes place when one electron is added to each atom in one mole of gaseous atoms to form one mole of gaseous 1- ions

Standard enthalpy change of solution

The enthalpy change when one mole of a solute dissolves in a solvent under standard conditions

Enthalpy change of hydration

The enthalpy change that accompanies the dissolving of gaseous ions in water to form one mole of aqueous ions under standard conditions

Standard conditions

100kPa, 298K, 1moldm^-3 concentration