Gibbs Free Energy

Gibbs free energy represents the amount of energy absorbed or released by a chemical reaction that is available to do work. It is defined as the change in enthalpy minus the temperature multiplied by the change in entropy. A chemical reaction will be spontaneous in the forward direction if the gibbs free energy is negative, or spontaneous in the reverse direction if the gibbs free energy is positive.

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Enter any three variables out of enthalpy, temperature, entropy, and Gibbs free energy to calculate the missing fourth variable: