Calculate the lattice energy of NaCl(s) using the following thermodynamic data (all data is in kJ/mol). Note that the data given has been perturbed, so looking up the answer is probably not a good idea. Na(s) ΔHsublimation = 88 kJ/mol Na(g) Ionization energy = 476 kJ/mol Cl-Cl(g) Bond energy = 223 kJ/mol Cl(g) Electron affinity = -369 kJ/mol NaCl(s) ΔH°f = -431 kJ/mol ____________ kJ/mol
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.
Calculate the lattice energy of NaCl(s) using the following
| Na(s) | ΔHsublimation = 88 kJ/mol |
| Na(g) | Ionization energy = 476 kJ/mol |
| Cl-Cl(g) | Bond energy = 223 kJ/mol |
| Cl(g) | |
| NaCl(s) | ΔH°f = -431 kJ/mol |
____________ kJ/mol
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