The solubility of oxygen in lakes high in mountains is affected by the altitude. If the solubility of O2 from the air is 2.67 × 10−4 M at sea level when the pressure is 1.000 atm and the temperature is 25°C, what is the solubility of O2 at an elevation of 12,000 ft. where the atmospheric pressure is 0.643 atm? Assume the temperature is 25°C, and that the mole fraction of O2 in air is 0.211 at both 12,000 ft. and at sea level.
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