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How to Calculate Delta G.
Chemistry

How to Calculate Delta G.

Rosemary Njeri

Delta g stands for change in Gibbs Free Energy.

Gibbs free energy is the maximum amount of non-expansion work that can be extracted from a thermodynamically closed system.

ΔG determines the direction and extent of chemical change.

Formula to calculate delta g.

Calculate Delta G.

ΔG is change in Gibbs free energy.

ΔH is change in enthalpy.

T is temperature in Kelvin.

ΔS is change in entropy.

Example:

If the change in enthalpy is 646 J and the temperature is 200K, calculate the Gibbs free energy if the change in entropy is 50 JK−1mol−1.

Calculate Delta G.

Therefore, the Gibbs free energy is -9,354 joules.

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