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Gibbs Free Energy Calculator

Precisely figure out the Gibbs free energy to determine the nature of the chemical reaction with the Gibbs free energy calculator.

Entropy change (ΔS):

KJ ▾

Enthalpy change (ΔH):

KJ ▾

Preture (P):

K ▾

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Gibbs Free Energy Calculator

Estimate the Gibbs free energy of a chemical reaction using this calculator to determine whether it can happen spontaneously or not. Using a Gibbs free energy calculator, you can analyze the reaction and optimize conditions for best results.

Understanding Gibbs Free Energy

Gibbs free energy is a thermodynamic concept defining the maximum reversible work that a system can perform at constant pressure and temperature. It is represented as G or ΔG, and helps predict reaction direction.

Units of Gibbs Free Energy

The SI units are joules (J) and kilojoules (kJ).

Why Calculate Gibbs Free Energy?

Gibbs free energy connects enthalpy and entropy changes to determine whether a process is spontaneous or non-spontaneous.

Spontaneous Process

If ΔG < 0, the reaction occurs spontaneously in the forward direction without external energy input.

Non-Spontaneous Process

If ΔG > 0, the reaction is non-spontaneous and requires external energy to proceed.

Equilibrium

If ΔG = 0, the system is at equilibrium, with forward and reverse reactions occurring at equal rates.

Gibbs Free Energy Equation

The Gibbs free energy change is calculated as:

ΔG = ΔH - TΔS

Where:

ΔG – Change in free energy
ΔH – Change in enthalpy (total heat) at constant pressure
T – Absolute temperature (Kelvin)
ΔS – Change in entropy

How to Calculate Gibbs Free Energy

Obtain the change in enthalpy (ΔH) of the system.
Determine the temperature (T) in Kelvin.
Multiply T by the change in entropy (TΔS) and subtract it from enthalpy: ΔG = ΔH - TΔS.

Alternatively, use the online Gibbs free energy calculator for instant and accurate results.

Practical Example

Given:

ΔH = 50 kJ
ΔS = 45 kJ
T = 30 K

Calculation:

ΔG = ΔH - TΔS

ΔG = 50 - (30 × 45) = -1300 kJ

Since ΔG < 0, the reaction is spontaneous.

How the Gibbs Free Energy Calculator Works

Input:

Change in enthalpy (ΔH)
Change in entropy (ΔS)
Temperature (T)

Output:

Gibbs free energy (ΔG)
Step-by-step calculation
Reaction classification: spontaneous, non-spontaneous, or equilibrium

FAQs

What is the relationship between entropy and Gibbs free energy?

Gibbs free energy and entropy are connected through the Gibbs-Helmholtz equation. Entropy helps determine the spontaneity of a process in combination with enthalpy changes.

What is the difference between entropy and enthalpy?

Enthalpy measures the total energy stored in a system, while entropy measures disorder or randomness within the system.

What happens to Gibbs free energy as entropy increases?

As entropy increases, Gibbs free energy decreases. Gibbs energy and entropy are inversely related.

What is free energy?

Free energy is the energy available to perform work while a system is in thermodynamic equilibrium. Its value depends on the system's state.

References

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