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The summability relation states that the total property of a solution is

  • A.the mole-fraction weighted sum of the partial molar values
  • B.the plain sum of all the pure component properties
  • C.the arithmetic average of all the partial molar properties
  • D.the product of the mole fractions and the pure values

Answer: A

It follows from the fact that the property is first order homogeneous in the amounts, and it is what makes partial molar properties useful rather than merely definable. The pure component sum is the ideal solution approximation instead.

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