At 750 ^$\circ$ C,water Has an Equilibrium Vapor Pressure of 289

question 78

Multiple Choice

At 75.0 ^$\circ$ C,water has an equilibrium vapor pressure of 289.1 mm Hg.If 4.22 g H₂O is sealed in an evacuated 5.00 L flask and heated to 75.0 ^$\circ$ C,what mass of H₂O will be found in the gas phase when liquid-vapor equilibrium is established? Assume any liquid remaining in the flask has a negligible volume.(R = 0.08206 L.atm/mol.K,1 atm = 760 mm Hg)

• A) 0.834 g
• B) 1.20 g
• C) 1.92 g
• D) 3.02 g
• E) 4.22 g

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