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**Table of Content**

Estimate the Gibbs free energy of a chemical reaction through this calculator and determine whether it can happen spontaneously or not.

When you are able to know the nature of the chemical reaction by the utilization of a Gibbs free energy calculator, you can manage the environmental factors relatively for the happening of a process.

This is a term of physics that is used in thermodynamics to define the maximum amount of reversible work that can be performed on a system under constant pressure and temperature.

It is represented by G or ΔG (delta G). ΔG also helps in predicting the direction of the chemical reaction.

The SI units that are used for Gibbs Energy are joules and kilojoules.

Gibbs energy allows you to relate the enthalpy change and entropy of a system to understand whether a process is spontaneous or nonspontaneous.

If ΔG < 0, then it means that the process is spontaneous and the direction is forward. Meanwhile, it will not require external energy to happen. When this happens the system goes towards the lower energy state.

If ΔG > 0, then it shows that the process is non-spontaneous but in the forward direction. It will require inputting the external energy for the happening of the process.

When ΔG = 0, it means the system is in equilibrium state. Meanwhile, the forward and reverse processes are happening at the same rate and same time.

Let’s take a look at the following delta g formula:

**ΔG = ΔH – TΔS**

Where

- ΔG represents the free energy change
- ΔH shows the change in enthalpy (total heat) at constant pressure
- T is the representative of absolute temperature
- ΔS is the variance in the entropy

Below we have outlined the steps to find out Gibbs Energy:

- First of all, you must have the change in enthalpy
- Determine the temperature change
- Now according to the delta g equation, multiply the temperature by the entropy and subtract it from the enthalpy of the system

If you don’t want to use Gibbs free energy equation to perform the calculation then get the help of an online Gibbs free energy calculator. It will let you calculate the Gibbs Energy instantly.

Suppose the Enthalpy change (ΔH) is 50 KJ, Entropy change (ΔS) is 45 KJ, and Temperature (T) is 30 K in a reaction. Then how to find delta g.

Given that:

Enthalpy change (ΔH) = 50 KJ

Entropy change (ΔS) = 45 KJ

Temperature (T) = 30 K

Now put these values in the Gibbs free energy formula:

ΔG = ΔH – TΔS

ΔG = 50 – 30 x 45

ΔG = -1300 KJ

This delta g calculator displays the Gibbs energy associated with a chemical reaction in no time by just taking a couple of simple inputs.

- Enthalpy change (ΔH)
- Entropy change (ΔS)
- Temperature (T)

- Gibbs free energy (ΔG)
- Step-by-step calculation
- Informs about whether the process is spontaneous, non-spontaneous, or equilibrium.

Gibbs energy and entropy are related through the Gibbs-Helmholtz equation and allow us to understand the happening of a process. The direction of the processes depends upon the enthalpy and the entropy change.

Enthalpy is the amount of energy stored in a compound, while entropy is the disorder within the compound. Entropy is the measure of disorder.

When the entropy increases the Gibbs energy decreases. Gibbs energy and Entropy are inversely proportional to each other.

This is an energy-like state of the system in which the system is in thermodynamic equilibrium. Its value is known by the state of the system. Use a Gibbs free energy calculator to calculate it seamlessly.

From the source of wikipedia.org: Gibbs free energy.

From the source of chemguide.co.uk: An introduction to Gibbs free energy.