It has been demonstrated that buckminsterfullerene (C60), another allotrope of carbon (page 63), may converted into diamond at room temperature and be 20,000 atmospheres pressure (about 2 GPa). The standard enthalpy of formation, AH, for buckmin- sterfullerene is 2320 kJ/mol at 298.2 K. (a) Calculate A,H° for the conversion of C6o to dia- mond at standard state conditions and 298.2 K. (b) Assuming that the standard entropy per mole of carbon in both C6o and diamond is comparable (both about 2.3 J/K mol), is the conversion of C60 to diamond product-favored at room temperature?
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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