3.1. Mass Fraction Notation

Try these first

1. 1.

   Define mass concentration.

   Hint

   Think about how much mass is present in a liter of water.

2. 2.

   What does ρA1 represent?

   Hint

   What are the media we discussed?

3. 3.

   What does ρA2 signify?

   • Mass concentration in solid
   • Mass concentration in air
   • Mass concentration in water

   Hint

   Refer back to the meanings of the indices.

4. 4.

   True or False: Mass fraction is the mass of a substance compared to the volume of the substrate.

   • True
   • False

   Hint

   Remember the definition of mass fraction.

5. 5.

   A researcher measures a pollutant and finds its mass concentration in water to be 80 mg/L. Given the water volume of 10 liters, how much total mass of the pollutant is present?

   Hint

   Use the concentration formula to calculate mass using the volume provided.

6. 6.

   If an organic chemical has a partition constant KA32 of 5, how does it imply the concentration relationship between solid and water?

   Hint

   Think what the partition constant represents regarding phase relationships.