Assume that the formation of the product MgCl2 in the reaction between magnesium ribbon and hydrochloric acid forms initially MgO which is a product of the oxidation of magnesium with the oxygen produced from the hydrolysis of water in the aqueous solution. Write the reactions that will lead to the formation of the final product MgCl2. Compute the molar enthalpy of the reaction of conversion of magnesium to magnesium chloride using the experimental value from the reaction of MgO with HCl and the computed molar heat of reaction -601.6 kJ/mol and 285.8kJ/mol. How would you compare it to the experimental value for the reaction of magnesium ribbon with hydrochloric acid?
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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