Energy available to do work defined as ΔG = ΔH − TΔS is known as what?

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Multiple Choice

Energy available to do work defined as ΔG = ΔH − TΔS is known as what?

Explanation:
The energy available to do work under conditions of constant temperature and pressure is Gibbs free energy. This quantity combines heat content and disorder: it takes the enthalpy change, ΔH, and subtracts T times the entropy change, TΔS. Intuitively, part of the energy change goes into heating or cooling the surroundings (ΔH), and part goes into making the system more disordered (TΔS). The remainder, ΔG, is the portion that can be used to perform work. Enthalpy is just the heat content of the system, not the usable work at constant pressure. Entropy measures disorder, not the usable energy left for doing work. Internal energy is the total energy of the system, not the portion available for work under these conditions.

The energy available to do work under conditions of constant temperature and pressure is Gibbs free energy. This quantity combines heat content and disorder: it takes the enthalpy change, ΔH, and subtracts T times the entropy change, TΔS. Intuitively, part of the energy change goes into heating or cooling the surroundings (ΔH), and part goes into making the system more disordered (TΔS). The remainder, ΔG, is the portion that can be used to perform work.

Enthalpy is just the heat content of the system, not the usable work at constant pressure. Entropy measures disorder, not the usable energy left for doing work. Internal energy is the total energy of the system, not the portion available for work under these conditions.

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