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Consider the following statements about choosing between the two conventions for a standard state.
1. Lewis-Randall suits a component present in large amount.
2. Henry suits a dilute solute such as a dissolved gas.
3. The choice changes the calculated equilibrium composition.

  • A.1 only
  • B.All of them
  • C.1 and 2 only
  • D.3 only

Answer: C

The first two are correct. The third is false, and importantly so: the convention changes the numbers in the intermediate quantities but the physical equilibrium it predicts must be the same. Thermodynamics cannot depend on a bookkeeping choice.

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