2. The questions which follow, are based on equations used in the construction of the Born- Haber cycle for the ionic compound MgO (s) a) Write the missing equations representing the enthalpy changes given. AH/kJ Heat of formation of MgO - 602 Heat of atomization of magnesium +148 First ionization energy of magnesium +738 Mg (g) Mg (g) + e" Second ionization of magnesium +1451 Heat of atomization of oxygen +249 First electron affinity of oxygen - 141 Second electron affinity of oxygen Og) + e +791 Lattice energy of MgO b) Selenium is below oxygen in Group VI of the periodic table. Suggest with a reason whether you would expect MgSe to have a higher or lower lattice energy than MgO. c) Sketch the Born-Haber cycle for MgO.
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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