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Fugacity was introduced because

  • A.the chemical potential diverges at zero pressure
  • B.chemical potential cannot be defined for a mixture
  • C.pressure is difficult to measure accurately
  • D.the Gibbs energy has no reference state

Answer: A

The logarithmic pressure term goes to minus infinity as pressure falls, which makes chemical potential awkward to work with numerically. Fugacity carries the same information in a quantity with the units and the finite behaviour of a pressure.

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