Calculate the Enthalpy (AH , in kJ/mol) using the appropriate bond dissociation rxn hergies (BDES) listed below (Hint: Draw out the Lewis structures of each species first): 2 H20 (g) + CO2 (g) → 2 O2 (g) + CH4 (g) Bond Type BDES (kJ/mol) O-H 467 C-H 413 O=0 498 C=O 799 "Based on the enthalpy value you calculated in part (a), discuss what this tells you from a molecular-level perspective.
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.
Bond dissociation energy is define as amount of energy required to break 1 mole of similar types of bond .This bond energies are always positive since they reflect the endothermic homolysis of a covalent bond.
Given reaction is :
Given :
| BOND TYPE | BDE IN kJ |
| O-H | 467 |
| C-H | 413 |
| O=O | 498 |
| C=O |
799 |
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