Question

Mass of an empty flask and stopper is 55.844g. 5mL of an unknown liquid is added and heated in a water bath at 99.7 degrees C. It then cools down. The stopper is removed and then replaced. The weight of all of this is 56.101g. The volume of the flask is 248.1 mL. Barometric pressure is 752 mm Hg. R=.0821 L atm/(mole K)

How do I find the pressure of the vapor?
What was the mass of the vapor in the flask?

Idk how to go about this..any help at all will be greatly appreciated ^_^

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