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.

Q1:

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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