A 4.7-L sealed bottle containing 0.33 g of liquid ethanol, C2H6O, is placed in a refrigerator and reaches equilibrium with its vapor at -11 degrees C. a) What is the mass of ethanol present in the vapor? b) When the container is removed and warmed to room temperature, 20 degrees C, will all the ethanol vaporize? c) How much liquid ethanol would be present at 0 degrees C? The vapor pressure of ethanol is 10 torr at -2.3 degrees C and 40 torr at 19 degrees C. --- My attempt: a) I have no idea how to approach this. b) No, because there will be condensation occurring at the same rate as vaporization, once it reaches equilibrium again. (?) c) I think I need to use PV=nRT for this... but I don't know how to relate the 2 different temperatures I'm getting (0 C and 19 C) Any suggestions would be appreciated, thank you!!