### Gibbs Free Energy Measurement

Posted:

**Tue Feb 19, 2019 10:08 pm**If Gibbs Free Energy (Delta G) is not measured directly like enthalpy of formation (Delta H), how is the Delta G of a reaction measured experimentally?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=135&t=42449

Page **1** of **1**

Posted: **Tue Feb 19, 2019 10:08 pm**

If Gibbs Free Energy (Delta G) is not measured directly like enthalpy of formation (Delta H), how is the Delta G of a reaction measured experimentally?

Posted: **Tue Feb 19, 2019 10:10 pm**

Delta G=Delta Hâ€” T * Delta S

Posted: **Tue Feb 19, 2019 10:18 pm**

By using the deltaH, deltaS, and T, we can find the value of delta G using the equation (deltaG= deltaH- T*deltaS)

Posted: **Tue Feb 19, 2019 10:20 pm**

How do you measure Gibbs Free Energy experimentally? (Without the use of the equation)

Posted: **Tue Feb 19, 2019 10:21 pm**

To confirm, do we find the Delta H and Delta S by using standard reaction formula (Sum of Products) â€” (Sum of Reactants)?

Posted: **Wed Feb 20, 2019 10:04 am**

I believe the most common way to come up with Gibbs free energy is using the methods listed above. In other words, if there is a way to measure Gibbs free energy directly from an experiment, I don't think we need to know it.