It should be noted that many of the energy definitions can be considered in the reverse direction with a corresponding change of sign for the energy. Bond formation = exothermic ΔH negative, bond cleavage = endothermic ΔH positive
The energy required to vaporise one mole of a liquid
The energy required to produce one mole of gaseous atoms from an element in its standard state
The energy change when one mole of a specific bond is broken or created
The average energy change when one mole of a specific type of bond is broken or created.
The energy released when one mole of a compound is burned in excess oxygen
The energy change when one mole of a compound is formed from its constituent elements in their standard states
The energy change when one mole of a substance is dissolved in an infinite amount of water
The energy change when a particle is taken from infinite separation in the gaseous state to its position in an aqueous lattice
The energy required to produce one mole of gaseous ions from one mole of gaseous atoms by removal of one mole of electrons
The energy change when one mole of an ionic substance is broken into its constituent atoms at infinite separation.
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