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.
Complete combustion of 1 mol of acetone 1C3H6O2 liberates
1790 kJ:
C3H6O(l) + 4 O2(g) -----> 3 CO2(g) + 3 H2O(l)
ΔH° = -1790 kJ
Using this information together with the standard enthalpies
of formation of O2(g), CO2(g), and H2O(l) from
Appendix C, calculate the standard enthalpy of formation of
acetone.
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