heat of dissociation

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the heat required for a fluid substance to break up into simpler constituents

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Heat of dissociation is the amount of heat energy required to break apart a specific chemical compound into its individual parts or elements. It is usually expressed in joules per mole or calories per mole. The heat of dissociation is positive if the process is endothermic (absorbs heat) and negative if it is exothermic (releases heat).