Lime is a term that includes calcium oxide (CaO, also called quicklime) and calcium hydroxide (Ca(OH) 2, also called slaked lime). It is used in the steel industry to remove acidic impurities, in air-pollution control to remove acidic oxides such as SO2, and in water treatment. Slaked lime is produced by treating quicklime with water: kJ Cao(s) H₂O) Ca(OH), (s) + → AH° -64.4 rxn mol kJ kJ and -288.6 respectively, calculate the standard enthalpy of formation of mol mol' Given the standard enthalpies of formation of CaO and H2O are -619.9 Ca(OH)2. Be sure your answer has the correct number of significant digits. kJ mol ☐ x10 х
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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