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What does a mass accuracy of five parts per million mean at mass 500?

  • A.An uncertainty of about 5 units
  • B.An uncertainty of about 0.5 units
  • C.An uncertainty of about 0.0025
  • D.An uncertainty of about 0.025

Answer: C

Multiplying the relative figure by the mass:

five parts per million of five hundred is about 0.0025 mass units, which is usually enough to select a single formula for a small molecule. Quoting accuracy relatively rather than absolutely makes it comparable across the mass range, and the absolute figure worsens in proportion as the mass rises.

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