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The activity of a component in solution is defined as

  • A.its fugacity divided by that in the standard state
  • B.the logarithm of its mole fraction in the mixture
  • C.its partial pressure divided by the total pressure
  • D.its chemical potential divided by the gas constant

Answer: A

Because the definition involves a ratio to a chosen standard state, an activity has no meaning until that state is named. The Lewis-Randall and Henry references are the two conventional choices. Each is suited to a different concentration range.

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