A chemist collects a sample of oxygen gas in the laboratory by water displacement on a day when the atmospheric pressure in the laboratory is 765 mm Hg. If the equilibrium vapor pressure of the water vapor in the collection vessel is 18 mm Hg, what is the partial pressure of the oxygen in the collection vessel? a. 747 mm Hg b. 765 mm Hg c. 783 mm Hg d. 18 mm Hg

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