In which of the following scenarios is ΔG equal to ΔH?
Practice Questions
Q1
In which of the following scenarios is ΔG equal to ΔH?
At high temperatures with ΔS = 0.
At low temperatures with ΔS = 0.
At constant pressure and temperature.
In a phase transition.
Questions & Step-by-Step Solutions
In which of the following scenarios is ΔG equal to ΔH?
Step 1: Understand what ΔG and ΔH represent. ΔG is the change in Gibbs free energy, and ΔH is the change in enthalpy (heat content).
Step 2: Know that ΔG indicates whether a process is spontaneous (can happen on its own) or not.
Step 3: Recognize that during a phase transition (like melting ice to water or boiling water to steam), the system is at equilibrium.
Step 4: At equilibrium, the energy changes in the system balance out, which means ΔG equals ΔH.
Step 5: Conclude that ΔG equals ΔH specifically during phase transitions because the system is not gaining or losing energy in a way that drives it away from equilibrium.
