APPENDIX C Ihermodynamic Quantities for Selected Substances at 298.15 K (25 1091 "C) AG (ki/mal) дн; (ki/mol) AGi (kj/mol) S' (kj/mol) -245.6 (1/mol-K) (i/mol-K) Substance Vanadium Substance SOCIE(1) HS(8) HSO4(aq) HSO,() -20.17 -33.01 205.6 453.1 182.2 514.2 Vg) V(s) - 744.5 20.1 156.1 -909.3 28.9 -814.0 -689.9 Zinc Titanium 130.7 95.2 160.9 Zn(g) TIg) TI(S) TICL() TICL(1) TIO:(s) 468 422 180.3 30.76 354.9 41.63 Zn(s) ZnCl, (8) ZnO(s) -369.4 -415.1 111.5 -763.2 -726.8 -728.1 -889.4 -348.0 -318.2 43.9 -804.2 -944.7 221.9 50.29
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 stratospheric ozone (O3) layer helps to protect us
from harmful ultraviolet radiation. It does so by absorbing
ultraviolet light and falling apart into an O2 molecule and an
oxygen atom, a process known as photodissociation.
O3(g)----->O2(g) + O(g)
Use the data in Appendix C to calculate the enthalpy change
for this reaction. What is the maximum wavelength a photon
can have if it is to possess sufficient energy to cause this
dissociation? In what portion of the spectrum does this
wavelength occur?
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