Using Henryâs law, determine the equilibrium concentration (mg/L) of oxygen in contact with 30 Â°C air which has 20.95% O2. Henryâs constant for O2 is given in your text on page 390 in units of atm/mol fraction. Calculate the mole fraction (mole of O2 per mole water) **Be sure to divide by the MW of water and multiply by the density of water

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Given that the solubility of O2 in water at 25oC is 8.70 ppm, calculate (a) the concentration of dissolved O2 in mol L-1 and (b) the value of the Henryâs law constant, in mol L-1 kPa-1, for O2 at this temperature? The atmospheric pressure is 1.00 atm. (Hint: the mole fraction of oxygen in air is 0.210).

The equilibrium partitioning of a chemical in a three-phase system comprised of air, soil and water can be approximated as follows:

Total mass = mass in air + mass in water + mass in soil

= (Vair)(Cair) + (Vwater)(Cwater) + (Vsoil)(Csoil)

Assume a system with a volume 1 L that it is divided into 600 mL water, 200 mL air and 200 mL soil. The soil has a bulk density (r_b) of 2.0 g/cm³ and a fraction organic matter of 2.5 percent. Into this system we introduce 100 mg pyrene, which has a Henryâs Law constant of 10^2.05 (mol/L-atm) and log Kow = 5.13 (L/kg). What would the mass of pyrene be in the air, soil and water phases at equilibrium? How does this compare to our estimate conducted in class? (Hints: pay attention to the units and determine a dimensionless Henryâs Law constant, which the text discusses)

1. The equilibrium partitioning of a chemical in a three-phase system comprised of air, soil and water can be approximated as follows: Total mass = mass in air + mass in water + mass in soil = (Vair)(Cair) + (Vwater)(Cwater) + (Vsoil)(Csoil) Assume a system with a volume 1 L that it is divided into 600 mL water, 200 mL air and 200 mL soil. The soil has a bulk density (ï²b) of 2.0 g/cm3 and a fraction organic matter of 2.5 percent. Into this system we introduce 100 mg pyrene, which has a Henryâs Law constant of 102.05 (mol/L-atm) and log Kow = 5.13 (L/kg). What would the mass of pyrene be in the air, soil and water phases at equilibrium? How does this compare to our estimate conducted in class? (Hints: pay attention to the units and determine a dimensionless Henryâs Law constant, which the text discusses)

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