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Three of the following are composition units that need no reference to temperature. Which is the odd one out?

  • A.molality
  • B.molarity
  • C.mole fraction
  • D.mass fraction

Answer: B

Molarity uses a volume of solution, which expands with temperature. The other three are all ratios of masses or mole numbers and are fixed once the mixture is made. Any unit built on a volume inherits the same problem.

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