When A reacts with B, the reaction produces C and D (reaction 1): 3A(s) + B(1) → 2C (1) + D(s) But when A reacts with C, the reaction produces B and D (reaction 2): 2A(s) + 2C(1) → 3B (1) + 2D(s) The heat of formation (at standard state) for A(s) is not available in any literature; however, the heat of formation (at standard state) for B, C, and D is available: B) = 600 kJ/mol C(1) = 950 kJ/mol D(s) = -100 kJ/mol Experiment shows that the heat of reaction of reaction 2 is thrice the amount of the heat of re- action of reaction 1 (say, heat of reaction of reaction 2 is 9, therefore, heat of reaction of reaction 1 is 3). Determine the heat of formation (at standard state) of A(s) (in kJ/mol).
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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