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Parts per million by mass means

  • A.moles of solute per million moles of solvent
  • B.the same thing as per cent by mass
  • C.milligrams of solute per kilogram of solution
  • D.millilitres of solute per litre of solution

Answer: C

One milligram in one kilogram is one part in a million by mass, which is the working definition. For dilute aqueous solutions it is nearly the same as milligrams per litre, since the density is close to one kilogram per litre.

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