1. Calculate the enthalpy of reaction (NOT molar enthalpy) for the combustion of ethene Answer: 2. Use your answer to question 1 to answer the following questions. a. Express the enthalpy of reaction calculated in question 1 as a molar enthalpy of reaction per mole of carbon dioxide Answer: b. Express the reaction enthalpy calculated in question 1 by writing it as a term in the balanced chemical equation m Answer: c. Draw an energy diagram to describe the change in chemical potential energy that occurs in this reaction. Label important parts of your diagram ( Answer: d. Indicate whether the reaction is exothermic or endothermic, and justify your answer by making reference to relevant concepts
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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