QUESTICE Construct a graphical Born-Haber cycle for the formation of MgF₂(s). Label chemical / physical changes involved, and the thermochemical descriptor (i.e. AHatomization, AHlattice, ionization energy, electron affinity, etc.) for transitions between levels. From the data provided, calculate the electron affinity of fluorine. Show all calculations. Relevant thermochemical data (in kJ/mol): ● MgF lattice energy (s): -2962 kJ/mol Enthalpy of formation of MgF₂ (s): -1124 kJ/mol Enthalpy of sublimation of magnesium: +146 kJ/mol 1st ionization energy of magnesium: +738 kJ/mol 2nd ionization energy of magnesium: +1451 kJ/mol Binding energy of F₂ (g): +159 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.
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