At 850°C, CaCO3 (calcite) undergoes substantial decomposition to yield CaO and CO₂. Assuming that the AH values of the reactant and products are the same at 850°C as they are at 25°C, calculate the enthalpy change (in kJ) if 73.7 g of CO₂ are produced in the reaction. Be sure your answer has the correct number of significant digits. Note: Reference the Thermodynamic properties of pure substances table for additional information. AH° = KJ X
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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