1. How is the pressure of the vaporized liquid determine? olume of the flask det
ID: 560519 • Letter: 1
Question
1. How is the pressure of the vaporized liquid determine? olume of the flask determined? 3. How is the temperature of the vapor determined? 4. How is the mass of the vapor determined? Use the following data to answer questions 5 and 6. Mass of dry flask, foil and rubber band Temperature of water bath Mass of dry flask, foil, rubber band, and vapor Volume of 125 mL flask Atmospheric pressure 74.72g 98.7 C 74.921g 0.152L 752 torr 5. How many moles of vapor are present? 6. What is the molar mass of the vapor?Explanation / Answer
Q1
Typically, via manometers
They will move a certain liquid and the "height" of such liquid will be the pressure ( via P = density*gravity*height)
Q2
The volume of the flask can be determined with addition of previously measured volume
Q3
Temperature of vapor can be assumed to be the temperature of the liquid is is held up
Q4
mass of vapor --> via ideal gas law, PV = nRT, then sovle for "n" then change via mass = mol*MW
Q5
moles:
PV = nRt
n = PV/(RT)
Pgas = Pttoal - Pvapor = 752 - 715 = 37
n = (37)(752)/(62.4*(98.7+273)) = 0.0002424
mass = (74.921-74.720) = 0.201
MM = mass/mol = 0.201/0.0002424
MM = 829.20 g/mol
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