Consider taking a 5 kg block of ice at -80 °C, and heating up until you have that same 5 kg of water as steam at 200 °C. You can divide this process into 5 steps. Which one of these required the most amount of energy? Here are some relevant data values. Cs(ice) = 2030 J/kg K Cs(water) = 4184 J/kg K Cs(steam) = 2080 J/kg K AfusionH = 333 kJ/kg Avapourization H = 2257 kJ/kg Heating ice from -80 °C to its melting point. Melting the ice. Heating water to its boiling point. Boiling the water to form steam. Heating the steam to 200 °C.
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.
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