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The Gibbs-Helmholtz equation relates

  • A.the entropy to the heat capacity at constant pressure
  • B.the fugacity to the compressibility factor of the fluid
  • C.the temperature dependence of Gibbs energy
  • D.the Gibbs energy to the Helmholtz energy at constant volume

Answer: C

Written as the derivative of Gibbs energy over temperature with respect to temperature, it gives minus enthalpy over temperature squared. It is the standard route from a measured enthalpy of reaction to the temperature dependence of an equilibrium constant.

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