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Gibbs Free Energy Formula

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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. Check FAQs

G = H - T \cdot S

G - Gibbs Free Energy?H - Enthalpy?T - Temperature?S - Entropy?

Gibbs Free Energy Example

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With units

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Here is how the Gibbs Free Energy equation looks like with Values.

Here is how the Gibbs Free Energy equation looks like with Units.

Here is how the Gibbs Free Energy equation looks like.

-19.648 = 1.51 - 298 \cdot 71

-19.648KJ = 1.51KJ - 298K \cdot 71J/K

-19.648 = 1.51 - 298 \cdot 71

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Gibbs Free Energy Solution

Follow our step by step solution on how to calculate Gibbs Free Energy?

FIRST Step Consider the formula

G = H - T \cdot S

Next Step Substitute values of Variables

∴

G = 1.51KJ - 298K \cdot 71J/K

Next Step Convert Units

∴

G = 1510J - 298K \cdot 71J/K

Next Step Prepare to Evaluate

∴

G = 1510 - 298 \cdot 71

Next Step Evaluate

∴

G = -19648J

LAST Step Convert to Output's Unit

∴

G = -19.648KJ

Gibbs Free Energy Formula Elements

Variables

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.

Symbol: G

Measurement: EnergyUnit: KJ

Note: Value can be positive or negative.

Formulas to find Gibbs Free Energy

Enthalpy

Enthalpy is the thermodynamic quantity equivalent to the total heat content of a system.

Symbol: H

Measurement: EnergyUnit: KJ

Note: Value can be positive or negative.

Formulas to find Enthalpy

Temperature

Temperature is the degree or intensity of heat present in a substance or object.

Symbol: T

Measurement: TemperatureUnit: K

Note: Value can be positive or negative.

Formulas to find Temperature

Entropy

Entropy is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work.

Symbol: S

Measurement: EntropyUnit: J/K

Note: Value can be positive or negative.

Formulas to find Entropy

Other formulas in Chemical Thermodynamics category

Go Cell Potential given Change in Gibbs Free Energy

E cell = - \frac{ΔG}{n \cdot [Faraday]}

Go Classical Part of Gibbs Free Entropy given Electric Part

Ξ k = (Ξ entropy - Ξ e)

Go Classical Part of Helmholtz Free Entropy given Electric Part

Φ k = (Φ - Φ e)

Go Electrode Potential given Gibbs Free Energy

EP = - \frac{ΔG}{n electron \cdot [Faraday]}

How to Evaluate Gibbs Free Energy?

Gibbs Free Energy evaluator uses Gibbs Free Energy = Enthalpy-Temperature*Entropy to evaluate the Gibbs Free Energy, Gibbs Free Energy formula is defined as a thermodynamic potential that measures the maximum reversible work obtainable from a closed system at constant temperature and pressure, indicating the spontaneity of a process and the balance between enthalpy and entropy. Gibbs Free Energy is denoted by G symbol.

How to evaluate Gibbs Free Energy using this online evaluator? To use this online evaluator for Gibbs Free Energy, enter Enthalpy (H), Temperature (T) & Entropy (S) and hit the calculate button.

FAQs on Gibbs Free Energy

What is the formula to find Gibbs Free Energy?

The formula of Gibbs Free Energy is expressed as Gibbs Free Energy = Enthalpy-Temperature*Entropy. Here is an example- -0.019648 = 1510-298*71.

How to calculate Gibbs Free Energy?

With Enthalpy (H), Temperature (T) & Entropy (S) we can find Gibbs Free Energy using the formula - Gibbs Free Energy = Enthalpy-Temperature*Entropy.

Can the Gibbs Free Energy be negative?

Yes, the Gibbs Free Energy, measured in Energy can be negative.

Which unit is used to measure Gibbs Free Energy?

Gibbs Free Energy is usually measured using the Kilojoule[KJ] for Energy. Joule[KJ], Gigajoule[KJ], Megajoule[KJ] are the few other units in which Gibbs Free Energy can be measured.

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Gibbs Free Energy Formula

Gibbs Free Energy Example

Gibbs Free Energy Solution

Gibbs Free Energy Formula Elements

Other formulas in Chemical Thermodynamics category

How to Evaluate Gibbs Free Energy?

FAQs on Gibbs Free Energy

Variable Name