Part A Hess's law states that "the heat released or absorbed in a chemical process is the same whether the process takes place in one or in several steps." It is important to recall the following rules: Calculate the enthalpy of the reaction 2NO(g) + O2 (9)→2NO2(g) given the following reactions and enthalpies of formation: 1. When two reactions are added, their enthalpy values are added. 2. When a reaction is reversed, the sign of its enthalpy value changes. 3. When the coefficients of a reaction A. N2(9) + O2(g)→NO2(9), A¡H = 33.2 kJ mol B. N2(9) + O2(9)→NO(g), AfH; = 90.2 kJ mol-1 1 %3D are multiplied by a factor, the enthalpy value is multiplied by that same factor. Express your answer with the appropriate units. • View Available Hint(s) ? AƒH° = Value Units Submit
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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