What is the molal concentration of oxygen in water at 20 °C that has been saturated with air at 1.00 atm ? Assume that the mole fraction of oxygen in air is 0.21 .
Strategy

Use Henry’s law to calculate the oxygen concentration in the water using the partial pressure of oxygen and the appropriate Henry’s law constant from Table 12.3.

Table 12.3

Transcribed Image Text:

TABLE 12.3 Henry's Law Constants for Several Gases in Water k (molal/atm) Gas Carbon dioxide Ethylene Helium Nitrogen Oxygen 0 C 7.60 x 10- 1.14 x 10-2 4.22 x 10-4 1.03 10-3 2.21 x 10-3 20 C 3.91 X 10- 5.60 x 10-3 3.87 x 10-4 7.34 x 10-4 1.43 X 10- 40 C 2.44 x 10- 10-3 3.43 x 3.87 x 10-4 5.55 x 10-4 1.02 X 10-3 60 C 1.63 x 10- 4.10 X 10-4 4.85 x 10-4 8.71 X 10-4