At 800 °C,water Has an Equilibrium Vapor Pressure of 355

At 80.0 °C,water has an equilibrium vapor pressure of 355.1 mm Hg.If 4.22 g H₂O is sealed in an evacuated 5.00 L flask and heated to 80.0 °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) 0.689 g
B) 1.45 g
C) 1.67 g
D) 2.77 g
E) 4.22 g