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Oxygen gas has a Henry's law constant of 1.66x10^-6 M/mmHg at 20.0 degrees C when dissolved in water. If the total pressure of gas (O2 gas plus water vapor) over water is 1.00 atm, waht is the concentration of O2 in the water in grams per milliliter? Presure of the water vapor at 20.0 degrees C = 17.5 mmHg.