Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25 °C) is Substance AHᵒf (kJ/mol) AG°f (kJ/mol)S (J/K-mol) Calcium Ca (s) CaCl2 (s) Ca₂+ (aq) Chlorine Cl2 (g) Cl- (aq) Oxygen O2 (g) H₂0 (1) Phosphorus P2 (g) 144.3 PC13 (g) -288.1 POCI3 (g) -542.2 Sulfur S (s, rhombic) 0 SO2(g) SO3(g) +795.8 -397.9 -795.8 0.00 0 -795.8 226.7 +397.9 0 -167.2 0 -285.83 kJ/mol. -269.9 -395.2 Ca (s) + Cl2 (g) → CaCl2 (s) -748.1 209.2 -131.2 -237.13 0 -300.4 -370.4 0 103.7 -269.6 -502.5 0 0 41.4 104.6 200.8 The value of AH° for the formation of calcium chloride from its constituent elements, 222.96 56.5 205.0 69.91 218.1 311.7 325 31.88 248.5 256.2
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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