Consider the combustion reaction of glycine at standard condition and 298 K: 9 5 1 NH₂CH₂COOH (s) + O₂ (g) → 2CO₂ (g) + H₂O (1) + N₂ (g) - 2 Using the thermochemical data in the table glycine (s) A,H (298K) kJ mol™¹ P,m JK¹¹ mol-¹ -1 0 S JK¹¹ mol-¹ m Calculate and answer: -532.9 99.2 103.5 O₂ (g) 0 29.4 205.1 CO₂ (g) -393.5 37.1 213.7 H₂O (1) -285.8 75.3 69.9 N₂ (g) a) The molar entropy change of the reaction AS at constant 1 atm and 298 K. b) The molar standard Gibbs free energy of the reaction AG at constant 1atm and 298 K. c) Is the reaction spontaneous at 1 atm and 298 K? Why or why not? 0 29.1 191.6
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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