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Heats of reactions

Definitions

The heat of fusion

The heat of fusion of a substance (= -ΔHfusion= -fusion enthalpy) is the quantity of heat transferred to the surroundings during the fusion (passage from solid to liquid) at constant pressure of one mole.

The heat of vaporization

The heat of vaporization of a substance (= -ΔHvaporisation= -vaporisation enthalpy) is the quantity of heat transferred to the surroundings during the vaporization (passage from liquid to gas) at constant pressure of one mole of this substance.

The heat of condensation

The heat of condensation of a substance (= -ΔHcondensation = -condensation enthalpy) is the quantity of heat transferred to the surroundings during the condensation (passage from gas to liquid) at constant pressure of one mole of this substance.

The heat of sublimation

The heat of sublimation of a substance (= -ΔHsublimation= -sublimation enthalpy) is the quantity of heat transferred to the surroundings during the sublimation (passage from solid to gas) at constant pressure of one mole of this substance.

The energy of (the first) ionization

The energy of (the first) ionization of an element (= ΔHionisation= -standard enthalpy of ionization) is the quantity of heat received by one mole of atoms of this element to remove one electron from each of its atoms.

The (first) electron affinity

The (first) electron affinity of an element (= ΔHelectron affinity ) is the quantity of heat received by one mole of atoms of this element to give one electron to each of its atoms.

The reticular energy

The reticular energy of ionic substances (= ΔHreticular= -standard reticular enthalpy) is the quantity of heat received by one mole of this substance to form the lattice.

The heat of hydratation

The heat of hydratation of ions (= -ΔHhydratation= -hydratation enthalpy) is the quantity of heat transferred to the surroundings by one mole of these ions during the hyratation (passage from gaseous ion to hydrated ion).