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The composition of a liquid mixture is normally not given in volume per cent because

  • A.volumes are not additive when liquids mix
  • B.liquid volumes cannot be measured accurately
  • C.volume per cent has no meaning for liquids
  • D.densities of liquids are all nearly equal

Answer: A

Mixing ethanol and water gives a total volume less than the sum of the parts, so a volume per cent does not describe a definite mixture. Mass and mole bases have no such difficulty. Ethanol and water are the standard demonstration of the effect.

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