The term used to describe the molecules that are being studied in a thermodynamic reaction is system.
Thermodynamics refers to the study of the relations between heat, work, temperature, and energy. The laws of thermodynamics define the way energy in a system change and whether the system can perform useful work on its surroundings. Thermodynamic reaction or control is a reaction in which the product ratio is determined by the relative stability of the products. Thermodynamic stability occurs when a system is in its lowest energy state, or in chemical equilibrium with its environment. Hence, thermodynamic studies study molecules within a system.
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