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## Credits

Softusvista Office (Pune), India
Team Softusvista has created this Calculator and 500+ more calculators!
Bhilai Institute of Technology (BIT), Raipur
Himanshi Sharma has verified this Calculator and 500+ more calculators!

## Gibbs Free Energy Solution

STEP 0: Pre-Calculation Summary
Formula Used
gibbs_free_energy = Enthalpy-(Temperature*Entropy)
ΔG = H-(T*S)
This formula uses 3 Variables
Variables Used
Enthalpy - Enthalpy is the thermodynamic quantity equivalent to the total heat content of a system. (Measured in Joule)
Temperature - Temperature is the degree or intensity of heat present in a substance or object. (Measured in Kelvin)
Entropy - Entropy is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work. (Measured in Joule per Kelvin)
STEP 1: Convert Input(s) to Base Unit
Enthalpy: 200 Joule --> 200 Joule No Conversion Required
Temperature: 85 Kelvin --> 85 Kelvin No Conversion Required
Entropy: 16.8 Joule per Kelvin --> 16.8 Joule per Kelvin No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
ΔG = H-(T*S) --> 200-(85*16.8)
Evaluating ... ...
ΔG = -1228
STEP 3: Convert Result to Output's Unit
-1228 Joule --> No Conversion Required
-1228 Joule <-- Gibbs Free Energy
(Calculation completed in 00.094 seconds)
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## < 11 Other formulas that you can solve using the same Inputs

Schottky Defect Concentration
no_of_schottky_defects = Number of atomic sites*exp(-Activation energy for Schottky formation/(2*[BoltZ]*Temperature)) Go
Equilibrium vacancy concentration
vacancy_concentration = Number of atomic sites*exp(-Activation energy for vacancy formation/([BoltZ]*Temperature)) Go
Temperature dependent diffusion coefficient
diffusion_coefficient = Pre-exponential factor*exp(-Activation energy for diffusion/([BoltZ]*Temperature)) Go
Temperature Dependence of the Energy Bandgaps
energy_gap = fitting parameter 1-((alpha*(Temperature^2))/(Temperature+beta)) Go
Dynamic Viscosity of Gases
dynamic_viscosity = ((Constant a)*(Temperature^(1/2)))/(1+Constant b/Temperature) Go
Compressibility Factor
compressibility_factor = Pressure*Specific Volume/([R]*Temperature) Go
Emmisive power of a body (Radiation)
power_per_area = (Emissivity*(Temperature)^4)*[Stefan-BoltZ] Go
Dew Point Depression
dewpoint_depression = Temperature-dewpoint Temperature Go
Reduced Temperature
reduced_temperature = Temperature/Critical Temperature Go
Specific Entropy
specific_entropy = Entropy/Mass Go
Voltage Equivalent of Temperature
voltage_equivalent_of_temperature = Temperature/11600 Go

## < 11 Other formulas that calculate the same Output

Gibbs free energy when ideal Gibbs free energy, pressure and fugacity is given
gibbs_free_energy = Ideal Gas Gibbs Free Energy+[R]*Temperature*ln(Fugacity/Pressure) Go
Gibbs free energy when ideal Gibbs free energy and fugacity coefficient is given
gibbs_free_energy = Ideal Gas Gibbs Free Energy+[R]*Temperature*ln(Fugacity coefficient) Go
Gibbs free energy when equilibrium constant due to pressure is given
gibbs_free_energy = -2.303*[R]*Temperature*ln(Equilibrium constant for partial pressure) Go
Gibbs free energy when equilibrium constant is given
gibbs_free_energy = -2.303*[R]*Temperature*log10(Equilibrium constant) Go
Change in Gibbs free energy if cell potential is given
gibbs_free_energy = (-Moles of electron transferred*[Faraday]*Cell potential) Go
Gibbs free energy when standard enthalpy is given
gibbs_free_energy = Change in enthalpy-(Temperature*Change in entropy) Go
Gibbs energy when enthalpy, temperature and entropy is given
gibbs_free_energy = Enthalpy-Temperature*Entropy Go
Actual Gibbs energy when excess and ideal solution Gibbs energy is given
gibbs_free_energy = Excess Gibbs Free Energy+Ideal solution Gibbs Free Energy Go
Actual Gibbs energy when residual and ideal gas Gibbs energy is given
gibbs_free_energy = Residual Gibbs Free Energy+Ideal Gas Gibbs Free Energy Go
Gibbs free energy if Gibbs free entropy is given
gibbs_free_energy = (-Gibbs free entropy*Temperature) Go
Change in Gibbs free energy if electrochemical work is given
gibbs_free_energy = -(Work Done) Go

### Gibbs Free Energy Formula

gibbs_free_energy = Enthalpy-(Temperature*Entropy)
ΔG = 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 and is denoted by ΔG 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) and Entropy (S) and hit the calculate button. Here is how the Gibbs Free Energy calculation can be explained with given input values -> -1228 = 200-(85*16.8).

### 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 ΔG = 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 and 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) and Entropy (S). With our tool, you need to enter the respective value for Enthalpy, Temperature and Entropy and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
How many ways are there to calculate Gibbs Free Energy?
In this formula, Gibbs Free Energy uses Enthalpy, Temperature and Entropy. We can use 11 other way(s) to calculate the same, which is/are as follows -
• gibbs_free_energy = -2.303*[R]*Temperature*log10(Equilibrium constant)
• gibbs_free_energy = -2.303*[R]*Temperature*ln(Equilibrium constant for partial pressure)
• gibbs_free_energy = Change in enthalpy-(Temperature*Change in entropy)
• gibbs_free_energy = Ideal Gas Gibbs Free Energy+[R]*Temperature*ln(Fugacity coefficient)
• gibbs_free_energy = Ideal Gas Gibbs Free Energy+[R]*Temperature*ln(Fugacity/Pressure)
• gibbs_free_energy = Enthalpy-Temperature*Entropy
• gibbs_free_energy = Residual Gibbs Free Energy+Ideal Gas Gibbs Free Energy
• gibbs_free_energy = Excess Gibbs Free Energy+Ideal solution Gibbs Free Energy
• gibbs_free_energy = (-Moles of electron transferred*[Faraday]*Cell potential)
• gibbs_free_energy = -(Work Done)
• gibbs_free_energy = (-Gibbs free entropy*Temperature)
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