The Henry\'s law constant for oxygen (O2) is 588 atm-L / mol at 10°C. What is th

Question

The Henry's law constant for oxygen (O2) is 588 atm-L / mol at 10°C. What is the concentration of dissolved oxygen in the surface layer of a lake (the epilimnion) assuming equilibrium with the atmosphere at this temperature? Assume 1 atm total pressure, but consider the partial pressure of oxygen in the atmosphere. Express your answer in mg / L.

Thank you.

1. Solubility of oxygen in water. (Jensen, Chapter 18; Course Notes) The Henry's law constant for oxygen (O2) is 588 atm-L/mol at 10°C. What is the concentration of dissolved oxygen in the surface layer of a lake (the epilimnion) assuming equilibrium with the atmosphere at this temperature? Assume 1 atm total pressure, but consider the partial pressure of oxygen in the atmosphere. Express your answer in mg/L

Explanation / Answer

Solution :-

Inn the air 21 % of the O2 is present

thereofre the poartial pressure of the O2 in the air is

21 % * 1 atm / 100 % = 0.21 atm

now using this partial pressure of the O2 lets calculate its concentration

formula

c= 0.21 atm / 588 atm L per mol

c = 0.000357 mol / L

now lets convert moles to mass of O2

0.000357 mol per L * (32 g / 1 mol)8(1000 mg / 1 g) = 11.4 mg/L

So the concetration of the O2 = 11.4 mg/ L

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