Worksheet: Converting between Units of Concentration

In this worksheet, we will practice converting between concentration units quantifying solutes by moles or mass and solvents by mass or volume.


The level of mercury in a stream was suspected to be above the minimum considered safe (1.0 one part per billion by weight). An analysis indicated that the concentration was 0.72 parts per billion. Assuming a density of 1.0 g/mL, what is the molarity of mercury in the stream?

  • A 3.6 μM
  • B 7.2 nM
  • C 72 nM
  • D 3.6 nM
  • E 3.6 mM

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