.011 .02- Pressure "P" mm Observed boiling point at P Boiling point corrected to 760 mm °C °C 400 700 1.0 600 300 6 500 - 20 30140 60 100 80 200- 300f 400 - 300 200 200 700 1500 100 100 в A Figure 13.2 Pressure-temperature alignment nomograph. How to use the nomograph: Assume a reported boiling point of 100°C (column A) at 1 mm. To determine the boiling point at 18 mm, connect 100°C (column A) to 1 mm (column C) with a transparent plastic rule and observe where this line intersects column B (about 280°C). This value would correspond to the normal boiling point. Next, connect 280°C (column B) with 18 mm (column C) and observe where this intersects column A (151°C). The approximate boiling point will be 151°C at 18 mm. (Reprinted courtesy of EMD Chemicals, Inc.) 4. O 88 +++

Arrange the following from the lowest melting point (1) to the highest melting point (4). HF [ Choose ] HCI v [ Choose ] 1 (lowest mp) 4 (highest mp) F2 C12 [ Choose ] 423

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The vapor pressure of pure water at 35°C is 42.2 mm Hg. What is the vapor pressure of a mixture of 7.5 g sucrose (C12H22011) and 42.5 g water? a. 21.8 mm Hg O b. 41.8 mm Hg O c. 35.9 mm Hg d. 40.6 mm Hg O e. 7.45 mm Hg

This graph shows how the vapor pressure of three liquids varies with temperature: vapor pressure, torr 900- 800 700 600- 500 400- 3001 200 1002 0. 100 110 120 Which liquid is the most volatile? Which is the least volatile? 130 temperature, °C Use the graph to answer the following questions: What is the normal boiling point of each liquid? Note: your answer must be within 1°C of the exact answer to be -ethylbenzene -acetic acid pyrrole Suppose a beaker of acetic acid is put inside a sealed tank containing acetic acid gas at 104. degree C and 478. torr. After ten minutes, will there be more liquid in the beaker, less liquid, or the same amount? 140 most volatile: least volatile: ethylbenzene: acetic acid: pyrrole: O more O less O the same choose one choose one °C 0 °℃ °℃ X ✪ ✪

Compare the TWO structures represented below: 0=S=0 Molecule A Molecule B a. Molecule A has a boiling point of -60 °C and Molecule B has a boiling point of -10 °C. Write 3 sentences to explain this difference in terms of the intermolecular forces that exist between the molecules in each pure substance (you might draw structural diagrams to support your explanation). b. Calculate the enthalpy of vaporization (AvapH) for Molecule A using the following experimental data: the vapour pressure is measured to be 6000 kPa at 75 °C and is 8800 kPa at 95 °C. H-S-H

8. which statement about the boiling point is FALSE?  A. The boiling point is higher for compounds with strong intermolecular forces.  B. The boiling point is higher for compounds with a high viscosity. C. The boiling point of a compound is an absolute constant. D. The boiling point of a compound is higher for nonvolatile compounds. E. All of the above statement are true.

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