an empty flask weighs 125.497 g. after vaporization of a sample of volatile liquid at a temperature of 100.4 oc, the flask was sealed, cooled to room temperature, and found to have a mass of 125.902 g. the atmospheric pressure was 760.3 mm hg. the flask was rinsed and completely filled with water at 18.1 oc. the mass of the water-filled flask was determined to be 372.331 g. what is the pressure of the gas that fills the flask in atmospheres? (enter your answer as a number without units.)