1. Ethene can react with steam to produce ethanol. (a) Write an equation for the reaction above. (b) i. Suggest a reason why the enthalpy change for the reaction cannot be measured directly. ii. Standard enthalpy of formation data can be used to calculate the enthalpy change of the reaction. Using the data from the table below, calculate the standard enthalpy change of the reaction. Molecule C₂H4 (8) H₂O(g) C₂H5OH (1) AH; (kJ mol-¹) +52.5 -241.8 -277.7 (c) Another way of producing ethanol is by reacting a chloroethane with aqueous sodium hydroxide. i. Name the type of reaction mechanism. ii. Explain what the words in your answer for part c(i) mean. iii. Draw the reaction mechanism for this reaction.
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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