Consider the heats of formation given in the table: AH'f (kJ/mol) Substance Acetylene Ammonia C₂H2(g) 226.7 -46.19 NH3(g) C6H6(0) 49.0 Benzene Calcium carbonate CaCo3(s) 1207.1 Calcium oxide CaO(s) -635.5 Carbon dioxide CO2 (8) Carbon monoxide CO(g) Diamond C(s) Ethane Ethanol Ethylene Formula AHxn (1) C₂H6(8) -84.68 C₂H5OH -393.5 -110.5 OA Hxn--163.8 kJ/mol OA Hxn-56.1 kJ/mol OA Hxn=327.6 kJ/mol A Hrxn=163.8 kJ/mol 1.88 C₂H4(8) 52.30 C6H12O6 = -327.6 kJ/mol -277.7 Substance Hydrogen chloride Hydrogen fluoride Hydrogen iodide Methane Methanol Propane Silver chloride Sodium bicarbonate Sodium carbonate Glucose -1273 (s) Hydrogen bromide HBr(g) -36.23 Water vapor Using these data, determine the enthalpy change for the reaction: 2 CH4(8) + O₂(g) → 2 CH3OH(1) Sodium chloride Sucrose Water Formula HCI(g) HF(g) HI(g) CH4(8) CH3OH (1) C3H8(8) AgCl(s) NaHCO (s) C12H22O (s) NaCl C12H22O H₂O(1) H₂O(g)
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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