Self-heating cans may be used to warm drinks such as coffee. When the button on the can is pushed, a seal is broken, allowing water and calcium oxide to mix and react. The reaction produces solid calcium hydroxide and releases heat. If more water is used the calcium hydroxide is produced as a solution instead of as a solid. The equation for the reaction is: CaO + H,Oo → Ca(OH) Using the following data, calculate the enthalpy change, in kJ mol', for this reaction. AH = -635 kJ mol Ca. H Ca → CaO %3D 2(R) () → H,O AH = -286 kJ mol- %3D 210 H. + Ca(OH), AH = -986 kJ mol 21g) Ca(OH), → Ca(OH)) AH = -82 kJ mol %3D
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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