For a reaction at constant temperature and pressure, which of the following is true?
Correct Answer: ΔG = ΔH - TΔS
- Step 1: Understand that ΔG represents the change in Gibbs free energy of a system.
- Step 2: Recognize that ΔH represents the change in enthalpy (total heat content) of the system.
- Step 3: Identify that ΔS represents the change in entropy (disorder) of the system.
- Step 4: Note that T is the absolute temperature in Kelvin.
- Step 5: Remember that at constant temperature and pressure, the relationship between these quantities is given by the equation ΔG = ΔH - TΔS.
- Step 6: Conclude that this equation helps determine if a reaction is spontaneous (ΔG < 0) or not (ΔG > 0).
- Gibbs Free Energy – The relationship between Gibbs free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) at constant temperature (T) and pressure.
- Thermodynamic Relationships – Understanding how changes in enthalpy and entropy affect the spontaneity of a reaction.
