The partial pressure of O2 in air at sea level is 0.21 atm . The solubility of O2 in water at 20 ∘C , at 1 atm gas pressure, is 1.38×10−3 M. Using Henry's law and the data in the introduction, calculate the molar concentration of O2 in the surface water of a mountain lake saturated with air at 20 ∘C and an atmospheric pressure of 650 torr.         Express the molar concentration to two significant figures.

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The partial pressure of O2 in air at sea level is 0.21 atm . The solubility of O2 in water at 20 ∘C , at 1 atm gas pressure, is 1.38×10−3 M.

Using Henry's law and the data in the introduction, calculate the molar concentration of O2 in the surface water of a mountain lake saturated with air at 20 ∘C and an atmospheric pressure of 650 torr.        

Express the molar concentration to two significant figures.
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