An unknown liquid has a heat of vaporization of 39.92 kJ/mole. If the normal boiling point is 82, what is vapor pressure (in torr) of this liquid at room temperature of 25 degrees C? HINT: Normal boiling point occurs when the vapor pressure of the liquid is the same as atmospheric pressure (1 atm or 760 mm Hg).

Use the phase diagram of Substance X below to find the boiling point of X when the pressure on the liquid is 3.7 atm. pressure (atm) 0- 8 solid liquid gas 100 temperature (K) 200 Note: your answer must be within 12.5 °C of the exact answer to be graded correct. ☐ °C G

Ethanol has a heat of vaporization of 38.56 kJ/mol and a normal boiling point of 78.4 °C. What is the vapor pressure of ethanol at 15 °C?

The pressure above a pure sample of solid Substance X at -180. °C is lowered. At what pressure will the sample sublime? Use the phase diagram of X below to find your answer. pressure (atm) 0.4- 0.2- solid liquid 0. 200 temperature (K) gas 400 Note: your answer must be within 0.025 atm of the exact answer to be graded correct. atm х