Two metal objects, A and B, each of mass 60.0 g, are prepared at different temperatures. They are brought into thermal contact and allowed to reach thermal equilibrium while insulated from the rest of the universe (i.e. no heat exchange). Object A has a specific heat of cs = 0.160 J/g·K, and object B has a specific heat of cs = 0.200 J/g·K. (a) If the final temperature (in K) of the system is 360 K (thermal equilibrium), and the initial temperature of object B is 288 K, what is the initial temperature of object A? (b) What is the entropy change (in J/K) for the system of two objects as they go through the process of reaching thermal equilibrium?
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.
Two metal objects, A and B, each of mass 60.0 g, are prepared at different temperatures. They are brought into thermal contact and allowed to reach thermal equilibrium while insulated from the rest of the universe (i.e. no heat exchange). Object A has a specific heat of cs = 0.160 J/g·K, and object B has a specific heat of cs = 0.200 J/g·K.
(a) If the final temperature (in K) of the system is 360 K (thermal equilibrium), and the initial temperature of object B is 288 K, what is the initial temperature of object A?
(b) What is the entropy change (in J/K) for the system of two objects as they go through the process of reaching thermal equilibrium?
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