In a proccess of Lithium Chloride synthesis, the following experimental data were collected. Its lattice energy can be calculated from a Born-Haber cycle. Ionization energy of Li = +520 kJ mol Heat to convert Li(s) to Li(g) = +159 kJ mol Heat of formation of LiCl = -409 kJ mol Heat to convert Cl2(g) to Cl(g) = +122 kJ mol Electron affinity of chlorine atoms = -349 kJ mol (a) Using the state symbols (s), (l), (g) and the symbol for an electron, e-, write an equation in each case to define the following terms: (i) The first ionization energy of lithium. (ii) The heat of formation of lithium chloride. (iii) The electron affinity of chlorine. (iv) The lattice energy of lithium chloride.
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.
Chemistry
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Question 1 |
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In a proccess of Lithium Chloride synthesis, the following experimental data were collected. Its lattice energy can be calculated from a Born-Haber cycle. Ionization energy of Li = +520 kJ mol Heat to convert Li(s) to Li(g) = +159 kJ mol Heat of formation of LiCl = -409 kJ mol Heat to convert Cl2(g) to Cl(g) = +122 kJ mol (a) Using the state symbols (s), (l), (g) and the symbol for an electron, e-, write an equation in each case to define the following terms: (i) The first ionization energy of lithium. (ii) The heat of formation of lithium chloride. (iii) The electron affinity of chlorine. (iv) The lattice energy of lithium chloride.
(b) Construct a labeled Born-Haber cycle for the formation of Lithium Chloride.
(c) Show the calculation for the lattice energy of Lithium Chloride.
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