## Gibbs Free Energy Solution

STEP 0: Pre-Calculation Summary
Formula Used
Gibbs Free Energy = Enthalpy-Temperature*Entropy
G = H-T*S
This formula uses 4 Variables
Variables Used
Gibbs Free Energy - (Measured in Joule) - Gibbs Free Energy is a thermodynamic potential that can be used to calculate the maximum of reversible work that may be performed by a thermodynamic system at a constant temperature and pressure.
Enthalpy - (Measured in Joule) - Enthalpy is the thermodynamic quantity equivalent to the total heat content of a system.
Temperature - (Measured in Kelvin) - Temperature is the degree or intensity of heat present in a substance or object.
Entropy - (Measured in Joule per Kelvin) - Entropy is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work.
STEP 1: Convert Input(s) to Base Unit
Enthalpy: 1.51 Kilojoule --> 1510 Joule (Check conversion ​here)
Temperature: 298 Kelvin --> 298 Kelvin No Conversion Required
Entropy: 71 Joule per Kelvin --> 71 Joule per Kelvin No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
G = H-T*S --> 1510-298*71
Evaluating ... ...
G = -19648
STEP 3: Convert Result to Output's Unit
-19648 Joule -->-19.648 Kilojoule (Check conversion ​here)
-19.648 Kilojoule <-- Gibbs Free Energy
(Calculation completed in 00.004 seconds)
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## Credits

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## <Chemical Thermodynamics Calculators

Gibbs Free Energy Change
​ Go Gibbs Free Energy Change = -Number of Moles of Electron*[Faraday]/Electrode Potential of a System
Electrode Potential given Gibbs Free Energy
​ Go Electrode Potential = -Gibbs Free Energy Change/(Number of Moles of Electron*[Faraday])
Cell Potential given Change in Gibbs Free Energy
​ Go Cell Potential = -Gibbs Free Energy Change/(Moles of Electron Transferred*[Faraday])
Gibbs Free Energy
​ Go Gibbs Free Energy = Enthalpy-Temperature*Entropy

## <Entropy Generation Calculators

Entropy Change at Constant Volume
​ Go Entropy Change Constant Volume = Heat Capacity Constant Volume*ln(Temperature of Surface 2/Temperature of Surface 1)+[R]*ln(Specific Volume at Point 2/Specific Volume at Point 1)
Entropy Change at Constant Pressure
​ Go Entropy Change Constant Pressure = Heat Capacity Constant Pressure*ln(Temperature of Surface 2/Temperature of Surface 1)-[R]*ln(Pressure 2/Pressure 1)
Entropy Change Variable Specific Heat
​ Go Entropy Change Variable Specific Heat = Standard molar entropy at point 2-Standard molar entropy at point 1-[R]*ln(Pressure 2/Pressure 1)
Entropy Balance Equation
​ Go Entropy Change Variable Specific Heat = Entropy of System-Entropy of Surrounding+Total Entropy Generation

## <Second Laws of Thermodynamics Calculators

Electrode Potential given Gibbs Free Energy
​ Go Electrode Potential = -Gibbs Free Energy Change/(Number of Moles of Electron*[Faraday])
Cell Potential given Change in Gibbs Free Energy
​ Go Cell Potential = -Gibbs Free Energy Change/(Moles of Electron Transferred*[Faraday])
Classical Part of Gibbs Free Entropy given Electric Part
​ Go Classical part gibbs free entropy = (Gibbs Free Entropy of System-Electric part gibbs free entropy)
Classical Part of Helmholtz Free Entropy given Electric Part
​ Go Classical Helmholtz Free Entropy = (Helmholtz Free Entropy-Electric Helmholtz Free Entropy)

## Gibbs Free Energy Formula

Gibbs Free Energy = Enthalpy-Temperature*Entropy
G = H-T*S

## What is Gibbs Free Energy?

Gibbs energy was developed in the 1870’s by Josiah Willard Gibbs. He originally termed this energy as the “available energy” in a system. His paper published in 1873, “Graphical Methods in the Thermodynamics of Fluids,” outlined how his equation could predict the behavior of systems when they are combined. Denoted by G, Gibbs Free Energy combines enthalpy and entropy into a single value. The sign of ΔG indicates the direction of a chemical reaction and determine if a reaction is spontaneous or not. When ΔG<0 : reaction is spontaneous in the direction written (i.e., the reaction is exergonic), when ΔG=0 : the system is at equilibrium and there is no net change either in forward or reverse direction and when ΔG>0 : reaction is not spontaneous and the process proceeds spontaneously in the reserve direction.

## How to Calculate Gibbs Free Energy?

Gibbs Free Energy calculator uses Gibbs Free Energy = Enthalpy-Temperature*Entropy to calculate the Gibbs Free Energy, Gibbs Free Energy is a thermodynamic potential that can be used to calculate the maximum of reversible work that may be performed by a thermodynamic system at a constant temperature and pressure. Gibbs Free Energy is denoted by G symbol.

How to calculate Gibbs Free Energy using this online calculator? To use this online calculator for Gibbs Free Energy, enter Enthalpy (H), Temperature (T) & Entropy (S) and hit the calculate button. Here is how the Gibbs Free Energy calculation can be explained with given input values -> -0.019648 = 1510-298*71.

### FAQ

What is Gibbs Free Energy?
Gibbs Free Energy is a thermodynamic potential that can be used to calculate the maximum of reversible work that may be performed by a thermodynamic system at a constant temperature and pressure and is represented as G = H-T*S or Gibbs Free Energy = Enthalpy-Temperature*Entropy. Enthalpy is the thermodynamic quantity equivalent to the total heat content of a system, Temperature is the degree or intensity of heat present in a substance or object & Entropy is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work.
How to calculate Gibbs Free Energy?
Gibbs Free Energy is a thermodynamic potential that can be used to calculate the maximum of reversible work that may be performed by a thermodynamic system at a constant temperature and pressure is calculated using Gibbs Free Energy = Enthalpy-Temperature*Entropy. To calculate Gibbs Free Energy, you need Enthalpy (H), Temperature (T) & Entropy (S). With our tool, you need to enter the respective value for Enthalpy, Temperature & Entropy and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
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