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Under the Lewis-Randall rule the standard state for a component is

  • A.the component as an ideal gas at one bar
  • B.the component at its critical point
  • C.the pure liquid at solution conditions
  • D.the component taken at infinite dilution

Answer: C

This is the convention in which the activity coefficient tends to one as the mole fraction tends to one. The Henry convention instead makes it tend to one at infinite dilution, which suits a solute. Naming the convention is part of quoting the number.

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