CHEM 134 Chapter Notes - Chapter 3: Diethyl Ether, Heptane, Torr
7 Feb 2018
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When evaporation and condensation no longer occur, the rate of evaporation is equal to the rate of condensation. At these conditions, the number of molecules in the vapor becomes constant. Escape energy - the minimum kinetic energy that a molecule in the liquid must have in order to be able to break from the surface of the liquid and enter the gas phase. Substance with the lowest intermolecular forces will have the highest vapor pressure. Since c 2 h 5 oh must be raised to a higher temperature than c 2 h 5 sh to have a vapor pressure of 400 torr, the intermolecular forces are stronger in c 2 h 5 oh . Vapor pressure increases with increasing temperature and decreases with decreasing temperature. The vapor pressure of c 2 h 5 oh is 400 torr at 63. 5 o c. Since vapor pressure decreases as temperature decreases, its vapor pressure will be lower at 17. 7 o c.
