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State whether the following is true or false.
For an ideal gas mixture, volume per cent and mole per cent are the same.

  • A.False
  • B.True only at large scales
  • C.False only at small scales
  • D.True

Answer: D

Equal volumes of ideal gases at the same conditions contain equal numbers of moles, so the two measures coincide. The equality fails for liquids, where volumes are not additive on mixing. Gas mixtures are the only case where the two coincide exactly.

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