Gibbs Free Energy Calculator

Ever wondered if a chemical reaction can happen on its own? That’s where Gibbs free energy comes in. Our Gibbs Free Energy Calculator makes it simple. Just enter your values for enthalpy, entropy, and temperature. You’ll get an instant answer with clear steps.

This tool isn’t just for students. Researchers, teachers, and science lovers will all find it handy.

What is Gibbs Free Energy?

Gibbs free energy, shown as ΔG, tells us if a reaction is spontaneous. It blends two key ideas:

• Enthalpy (ΔH) – the heat change in a system.
• Entropy (ΔS) – the disorder or randomness of particles.

The formula combines them with temperature (T). It’s written as:

ΔG = ΔH − TΔS

If ΔG is less than zero, the reaction is spontaneous. If it’s greater than zero, the reaction is non-spontaneous. And if ΔG equals zero, the system is at equilibrium.

Think of it like a balance. Heat and disorder pull the reaction in different directions. Gibbs free energy shows which side wins.

How to Calculate Gibbs Free Energy?

The formula is simple in practice:

ΔG = ΔH − TΔS

Here’s what the terms mean:

• ΔG: Gibbs free energy (Joules or kJ).
• ΔH: Change in enthalpy (J or kJ).
• ΔS: Change in entropy (J/K).
• T: Temperature in Kelvin.

Example:

Suppose ΔH = −92.22 kJ, ΔS = −0.19875 kJ/K, and T = 293.15 K.

ΔG = −92.22 − (293.15 × −0.19875)

ΔG = −33.96 kJ

Since ΔG is negative, the reaction is spontaneous.

What is the Relationship Between ΔH and ΔS?

Enthalpy (ΔH) shows heat flow. Entropy (ΔS) shows disorder. When both push in the same direction, the result is clear.

• If ΔH is negative and ΔS is positive, the reaction is always spontaneous.
• If ΔH is positive and ΔS is negative, it’s always non-spontaneous.
• If both are negative or both are positive, temperature decides the outcome.

Our calculator makes this easy. Enter the values, and it does the math for you.

How to Use the Gibbs Free Energy Calculator?

Using the calculator is quick and simple:

1. Enter enthalpy (ΔH) with its unit.
2. Enter entropy (ΔS) with its unit.
3. Add temperature (T) in °C, K, °F, or R.
4. Hit “Calculate” to get ΔG.

The tool will show each step, from unit conversion to the final result. You’ll also see if the reaction is spontaneous or not.

Final Verdict

The Gibbs Free Energy Calculator helps you understand reactions without stress. You don’t need long equations or messy notes. Just input your numbers and see the result.

This tool saves time, clears confusion, and gives you instant answers. Whether you’re learning chemistry or testing a real reaction, it’s the right tool for the job.

FAQs

How do I calculate Gibbs free energy?

Use the formula ΔG = ΔH − TΔS. Plug in enthalpy, entropy, and temperature, then solve.

Why is Gibbs free energy zero at equilibrium?

Because the forward and backward reactions happen at the same rate. There’s no net energy change.

What does Gibbs free energy tell us?

It shows if a reaction is spontaneous, non-spontaneous, or at equilibrium.

What is ΔG, ΔH, T, and ΔS?

ΔG = Gibbs free energy, ΔH = enthalpy, T = temperature, ΔS = entropy.

How do you calculate ΔG for a reaction?

Find ΔH, ΔS, and T. Convert to correct units if needed. Use the formula to solve.