Gibbs Energy

• Gibbs free energy (∆G) is the energy of a system at equilibrium
• Gibbs energy is calculated as follows

  $∆G=$$∆H-T∆S$
• If ∆G is less than zero then the reaction should occur
• If ∆G is greater than zero then there is no reaction
• Positive ∆G means the reaction is non-spontaneous
• Negative ∆G means the reaction is spontaneous