1. Convert the following concentrations to parts per million. Consider the density of water at 20°C

a) 250 mg/L
c) 2,840 mg/L
b) 500 mg/L
d) 13 g/L

2. Convert the following concentrations to percent. Assume the density of the liquid is 1 g/mL

a) 2,840 mg/L
c) 250 mg/L
b) 13 g/L
d) 0.9 g/L

3. Convert the following soil contaminant concentrations to concentration expressions in ppm.

a) 0.58 µg/kg
b) 58 µg/kg
c) 15 g/kg

4. Convert the following soil contaminant concentrations to concentration expressions in percent.

a) 0.58 µg/kg
b) 58 µg/kg
c) 15 g/kg

5. Convert the following percent concentrations of sulfur dioxide gas in air to a volume-to-volume expression; use m3 / 106 m3 .

a) 0.86 % SO2
c) 0.15 % SO2
b) 0.032 % SO2
d) 2.17 % SO2

6. Convert the following concentrations of air contaminants expressed in ppm to units of µg/m3

a) 35 ppm CO2
b) 0.2 ppm SO2
c) 0.15 ppm O3
d) 0.075 ppm NO2

7. The following air volumes begin at a standard condition of temperature and pressure (Use 0°C and 1 atmosphere for STP) and are then subjected to a change in temperature or pressure, or both, as given. What is the new volume? Report the new volume in the same units of the original volume.

a) 10 m 3 (STP) changed to 1.43 atm. and 15°C
b) 35.6 m 3 (STP) changed to 1 atm and 30°C
c) 100 m 3 (STP) changed to 0.95 atm and 32°F
d) 0.5 m 3 (STP) changed to 3.88 psi and 105°F