Consider benzene in the gas phase, CH5(9). Part A What is the standard enthalpy change for the reaction that represents breaking all the bonds in Benzene gaseous benzene, C, H6(9)? Use the heat of formation, Af H°, values below to answer the questions. Express your answer to one decimal place and include the appropriate units. View Available Hint(s) Af H° Substance (kJ mol-1) ? H(9) 217.94 C(g) 718.4 A‚H° = Value Units C,Hs(9) 82.9 Part B What is the chemical equation for the reaction that corresponds to breaking just the carbon- carbon bonds in gaseous benzene, C, H6(g)? Indicate the phase of each species in your answer. Express your answer as a chemical equation including phases. • View Available Hint(s) ΑΣφ ? OA chemical reaction does not occur for this question.
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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