<p>"A group of people, measured an empty Erlenmeyer Flask and a tight-fitting stopper and found the mass to be 62.371g. They then measure carefully out 4.4mL of volatile liquid, poured the liquid in the flask, and heated the flask containing the liquid in a 101.1 degrees Celsius boiling water bath. As soon as the liquid had vaporized, the flask was covered with stopper and set aside to cool. The mass of stopper, flash and condensed vapor was 63.088g. at the conclusion, the students rinsed out the flask, filled with water to the top, replaced the tight fitting stopper and obtained a volume of 261.9 mL. The barometric air pressure that day was 733. mm Hg.</p>
<p>a)Calculate pressure of the vapor inside the flask (in atm) after the vapor had cooled and the students opened the flask momentarily.
b) Calculate the mass of 1 mole of the vapor. "</p>
<p>Any help would be appreciated</p>