Standard enthalpy change of a reation: is the enthalpy change when the reaction occurs in the molar quantities shown in the chemical equation, under standard conditions in their standard states.
Standard enthalpy change of formation: is the enthalpy change when 1 mole of a compound is formed from it's elements in their standard states under standard conditions.
Standard enthalpy change of combustion: is the enthalpy change when 1 mole of a substance is completely burned in oxygen under standard conditions.
Standard enthalpy of neutralisation: is the enthalpy when 1 mole of water is formed from the neurtralisation of hydrogen ions by hydroxide ions under standard conditions.
Standard enthalpy change of atomisation: is the enthalpy change when 1 mole of gaseous atoms is formed from the element in its standard state.
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