Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
- Calculate the heat required to vaporize 102 g of water at a temperature of 100oC if the Heat of Vaporization for water is 2258 J/g.
The process of conversion of a substance in its liquid state into its gaseous state is called vaporization. When a liquid boils, the particles move much farther apart from one another, such that the attractive forces are minimal. Some amount of energy must be supplied in order to overcome the attractive forces among the particles.
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