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An ideal solution is defined by the condition that

  • A.the enthalpy of mixing is a large positive quantity
  • B.the volume of mixing is a negative quantity
  • C.the components have identical molar masses
  • D.each fugacity is proportional to its mole fraction

Answer: D

The Lewis-Randall rule states this proportionality with the pure component fugacity as the constant, and every ideal solution property follows from it. Molar mass has nothing to do with ideality. Chemical similarity is what matters in practice.

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