Gibbs Free Energy - Entropy, Enthalpy & Equilibrium Constant K | Summary and Q&A

TL;DR

Gibbs free energy (ΔG) is a key factor in determining whether a reaction is spontaneous or non-spontaneous, with negative ΔG indicating spontaneity.

Key Insights

• 🤩 ΔG is a key factor in determining the spontaneity of a reaction.
• 🚱 A negative ΔG indicates a spontaneous process, while a positive ΔG indicates a non-spontaneous process.
• ☠️ ΔG is zero at equilibrium, when the forward and reverse reactions occur at the same rate.
• 💦 The maximum work that can be obtained from a spontaneous process is equal to ΔG.
• 🪛 Non-spontaneous processes require energy input to drive the reaction forward.
• 💨 Spontaneous processes occur in a way that lowers the energy of the system.
• 💱 ΔG can be calculated using the formula: ΔG = ΔH - TΔS, where ΔH is the enthalpy change and ΔS is the entropy change.

Transcript

in this video we're going to focus on problems associated with gibbs free energy so let's start with this question which of the following statements is false the change in free energy delta g is less than zero for a spontaneous process is that true or false and what about b is it equal to zero at equilibrium or is d true is it greater than zero for... Read More

Questions & Answers

Q: What does it mean when ΔG is negative?

A negative ΔG indicates a spontaneous process, where the reaction can lower its energy and occur in a way that reaches the lowest possible energy state.

Q: When is ΔG equal to zero?

ΔG is zero at equilibrium, when a reversible process is taking place and the forward and reverse reactions occur at the same rate.

Q: When is ΔG greater than zero?

ΔG is greater than zero for non-spontaneous processes, indicating that energy needs to be inputted to drive the reaction forward.

Q: What is the maximum work that can be obtained from a spontaneous process?

The maximum work that can be obtained from a spontaneous process is equal to ΔG, as the process occurs in a way that releases energy.

Summary & Key Takeaways

• Gibbs Free Energy (ΔG) is a measure of the energy available to do work in a system, and it determines whether a process is spontaneous or non-spontaneous.

• ΔG is negative for spontaneous processes, indicating that the reaction can lower its energy and occur in a way that reaches the lowest energy state.

• ΔG is zero at equilibrium, when a reversible process is taking place.

• ΔG is positive for non-spontaneous processes, requiring the input of energy to drive the reaction forward.