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Equilibrium is established between Br2(l) and Br2(g) at 25.0 (degrees)C. A 250.0 ml sample of the vapor weighs 0.486g. What is the vapor pressure of bromine at 25.0 (degrees)C, in millimeters of mercury.

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Can you do this using PV = nRT?
You know V, n(or can calculate n), R, and T. Solve for P.

226.1 mm Hg

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