b Plot these data so that you have a graph resembling the one in figure below. Pressure (mm Hg) 1000 800 760 mm Hg Normal BP 34.6 °C Normal BP 78.3 °C Normal BP 100 °C 600 Diethyl Ethanol H₂O ether 400 200 0 -20° 0° 20° 40° 60° 80° 100° 120° Temperature (°C) At what temperature does the liquid have an equilibrium vapor pressure of 250 mm Hg? Temperature = °C At what temperature is the vapor pressure 650 mm Hg? Temperature= °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

A chemist determined vapor pressures of an unknown substance at different temperatures. The data was plotted as ln(P) vs 1/T (temperature in Kelvin). What is △H∘vap of this substance in kJ/mol?

kJ The enthalpy of vaporization of Substance X is 10.0 and its normal boiling point is 110. °C. Calculate the vapor pressure of X at 33. °C. mol Round your answer to 2 significant digits. atm х10

This graph shows how the vapor pressure of three liquids varies with temperature: 900 800 700 600 500 400 300 200 octane acetylacetone orthoxylene 100. 100 110 120 130 140 temperature, °C Use the graph to answer the following questions: Which liquid is the most volatile? most volatile: choose one Which is the least volatile? least volatile: choose one O°c octane: What is the normal boiling point of each liquid? Note: your answer must be within 1°C of the exact answer to be graded correct. acetylacetone: orthoxylene: Suppose a beaker of acetylacetone is put inside a sealed tank containing acetylacetone gas at 119. degree C and 206. torr. After ten minutes, will there be more liquid in the beaker, less liquid, or the same amount? more less the same vapor pressure, torr

Consider the phase diagram shown. What is the normal sublimation point at 1 atm? Pressure (not to scale) 72.9 atm 5.1 atm 1 atm O 0°C O 100°C -56.7 °C 31°C -78.5 °C SOLID LIQUID GAS -78.5 °C -56.7 °C Temperature (not to scale) 31 °C

This question is not a grade question, its just a pratice problem.

Based on the graph which describes two liquids, A and B, select ALL of the FALSE statements. XA OA The substance with the higher pure vapor pressure (P") is B OB. The substance with the higher pure vapor pressure (P°) is A OC. For any mixture of A and B (any ratio of A and B), the mole fraction of B in the vapor phase will be larger than the mole fraction of B in the liquid phase. OD. An equimolar mixture of liquids A and B are placed in a closed container (25 °C). At equilibrium, the vapor above the mixture will contain more moles of B than A OE Substance B has greater intermolecular forces than A MacBook Pro esc %23 & 1 2 3 4 5 6 7 8 9. delete Q E R T. Y tab A D F G J K os lock > V B N M control option command command option vapor pressure

The following compounds are liquid at -10 °C: diethyl ether, methanol, and ethylene glycol. Arrange the three compounds in order of increasing vapor pressure at -10 °C. Choose between 1 - lowest vapor pressure, 2, or 3 - highest vapor pressure. Note: Reference the Phase change properties of pure substances table for additional information. Ethylene glycol (Choose one) Methanol (Choose one) Diethyl ether (Choose one) G

In addition to filling in the blanks below, show all of your work for this problem on paper for later upload. The heat of vaporization of isopropanol is 44.0 kJ/mol. The vapor pressure of isopropanol at 400 torr is 67.8 °C. Calculate the normal boiling point of isopropanol. Enter your value in the first box and an appropriate unit of measure in the second box.