APPENDIX C Thermodynamic Quantitles for Selected Substances at 298.15 K (25 "C) 1091 дн; (kj/mol) AG; S* S° дн AG; (kj/mol) -245.6 (kj/mol) (i/mol-K) Substance Substance (i/mol-K) (kj/mol) Vanadium SOCI (1) H,S(8) H2SO4(aq) H,SO,(1) 205.6 20.1 182.2 -20.17 -33.01 514.2 453.1 V(g) V(s) -909.3 -744.5 28.9 156.1 -689.9 -814.0 Zinc Titanium 130.7 95.2 160.9 Zn(g) Ti(g) Ti(s) 468 180.3 422 41.63 Zn(s) ZnCl,(s) ZnO(s) -369.4 -415.1 111.5 30.76 -763.2 -726.8 354.9 TICL4(8) TICI4(1) TIO2(s) -318.2 -348.0 43.9 -804.2 -728.1 221.9 -889.4 50.29 -944.7
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.
The hydrocarbons acetylene (C2H2) and benzene (C6H6)
have the same empirical formula. Benzene is an “aromatic”
hydrocarbon, one that is unusually stable because of its structure.
(a) By using data in Appendix C, determine the standard
enthalpy change for the reaction 3 C2H2(g)-----> C6H6(l).
(b) Which has greater enthalpy, 3 mol of acetylene gas or
1 mol of liquid benzene? (c) Determine the fuel value, in
kJ/g, for acetylene and benzene.
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