Gibbs Free Energy Calculator

The reaction is at equilibrium.

Find ΔG and whether a reaction is spontaneous.

ΔG (kJ/mol) -114.9

Spontaneous? Yes (spontaneous)

Formula: ΔG = ΔH − TΔS

Step-by-step with your numbers:

1. Values used:

2. ΔH (enthalpy) = -100 kJ/mol

3. Temperature = 298 K

4. ΔS (entropy) = 50 J/mol·K

6. ΔG = -114.9kJ/mol

7. Spontaneous? = Yes (spontaneous)

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Gibbs free energy predicts whether a reaction proceeds spontaneously.

The math behind it

ΔG = ΔH − T·ΔS (ΔS converted from J to kJ). ΔG < 0 is spontaneous.

ΔH −100, 298 K, ΔS 50 → ΔG −114.9 kJ/mol (spontaneous).

ΔG = 0?

The reaction is at equilibrium.