Thermodynamics Question Regarding Gibbs Free Energy, Enthalpy, Entropy

Thread starter aquastor
Start date Apr 10, 2023
Tags

Energy Enthalpy Entropy Free energy Gibbs Gibbs free energy Thermodynamics

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Apr 10, 2023

aquastor

please post homework questions in the homework forum and fill the template

Hello,
is someone able to explain why these two are wrong. I am not sure how to figure out the enthalpy direction as the reaction is not changing state of matter, nor is it changing temperature.

(Please solve without calculating anything)

Thank you

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Apr 10, 2023

Borek

Mentor

Is the reaction spontaneous?

What is bond energy of a triple bond?

1. What is Gibbs free energy and why is it important in thermodynamics?

Gibbs free energy is a thermodynamic quantity that measures the amount of energy available for a system to do useful work. It takes into account both the enthalpy (heat content) and entropy (disorder) of a system. In thermodynamics, it is important because it helps us predict whether a reaction or process will occur spontaneously or not.

2. How is Gibbs free energy related to enthalpy and entropy?

Gibbs free energy is related to enthalpy and entropy through the equation ΔG = ΔH - TΔS, where ΔG is the change in Gibbs free energy, ΔH is the change in enthalpy, ΔS is the change in entropy, and T is the temperature in Kelvin. This equation shows that Gibbs free energy is dependent on both enthalpy and entropy.

3. What is the difference between ΔG and ΔH?

ΔG (Gibbs free energy) and ΔH (enthalpy) are both thermodynamic quantities that measure energy. The main difference between them is that ΔG takes into account the entropy of a system, while ΔH does not. This means that ΔG is a more accurate measure of the energy available for a system to do work.

4. Can Gibbs free energy be negative?

Yes, Gibbs free energy can be negative. A negative ΔG indicates that the reaction or process is spontaneous, meaning it will occur without the input of external energy. This is because the system has more energy available to do work than it did before the reaction or process.

5. How is Gibbs free energy used to determine the equilibrium of a reaction?

The equilibrium of a reaction can be determined by looking at the value of ΔG. If ΔG is negative, the reaction will proceed in the forward direction and reach equilibrium. If ΔG is positive, the reaction will not occur spontaneously and will not reach equilibrium. When ΔG is zero, the reaction is at equilibrium.