Free Energy and theEquilibrium Constant

• At Equilibrium, ?Grxn is 0 and Q = Keq

• Substitute these values into the free energy equation: ?Grxn = ?G?rxn + RT ln Q

  • 0 = ?G?rxn + RT ln Keq
  • ?G?rxn = -RT ln Keq

Example 20.4. The standard free energy change for the reaction below is -32.9 kJ. Calculate the equilibrium constant for this reaction.

N2(g) + 3 H2(g) ? 2 NH3(g)

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