Study the following phase diagram of Substance X. 12- solid 6- liquid gas 200 400 600 temperature (K) Use this diagram to answer the following questions. Suppose a small sample of pure X is held at 84. °C and 5.1 atm. What will be the state of the (choose one) sample? Suppose the temperature is held constant at 84. °C but the pressure is decreased by 2.8 atm v (choose one) What will happen to the sample? Nothing. It will melt. It will freeze. Suppose, on the other hand, the pressure is held constant at 5.1 atm but the temperature is decreased by 328. °C. What will happen to the sample? It will boil. It will condense. It will sublime. It will deposit. pressure (atm)

Refer to the following phase diagram (not to scale!) for argon: 48 1.00 P atm 0.68 83.8 83.9 87.4 150.6 T Kelvin A sample of argon at a pressure of 0.680 atm and a temperature of 82.5 K is compressed at constant temperature to a pressure of 52.8 atm. Which of the following are true? Choose all that apply O No phase change will occur. O The final state of the substance is a solid. The liquid initially present will vaporize. The sample is initially a gas. O The sample is initially a solid. Drovious

The pressure above a pure sample of solid Substance X at -142. °C is raised. At what pressure will the sample melt? Use the phase diagram of X below to find your answer. بالا pressure (atm) 0 0. atm solid liquid 200 temperature (K) Note: your answer must be within 0.125 atm of the exact answer to be graded correct. gas X 400

Study the following phase diagram of Substance X. pressure (atm) 36 18 0. 0 solid liquid 200 gas 400 temperature (K) Use this diagram to answer the following questions. Suppose a small sample of pure X is held at - 165. °C and 26.2 atm What will be the state of the sample? Suppose the temperature is held constant at -165. °C but the pressure is decreased by 18.3 atm. What will happen to the sample? ✓ (choose one) C solid liquid gas î

Substance X is known to exist at 1 atm in the solid, liquid, or vapor phase, depending on the temperature. Additionally, the values of these other properties of X I have been determined: melting point enthalpy of fusion temperature (°C) 120- 110- 100- 90- 80 70- 60- You may also assume X behaves as an ideal gas in the vapor phase. Suppose a small sample of X at 20 °C is put into an evacuated flask and heated at a constant rate until 10.0 kJ/mol of heat has been added to the sample. Graph the temperature of the sample that would be observed during this experiment. density 50+ 40 30- 20 65. °C 10.00 kJ/mol 3 2.80 g/cm³ (solid) 2.30 g/mL (liquid) 0 heat added (kJ/mol) 8 9 boiling point enthalpy of vaporization 10 heat capacity P 100. °C X 21.00 kJ/mol -1 38. J K mol (solid) 29. J.K¹ mol 48. J.K¹ mol 1 (liquid) (vapor) 2 00 ola Ar B

This graph shows how the vapor pressure of three liquids varies with temperature: vapor pressure, torr 900- 800- 700- 600- 500- 400. 300. 200- 100- 0 50 60 80 temperature, °C Use the graph to answer the following questions: 70 Which liquid is the most volatile? Which is the least volatile? 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. Suppose a beaker of acetone is put inside a sealed tank containing acetone gas at 54. degree C and 709. torr. After ten minutes, will there be more liquid in the beaker, less liquid, or the same amount? tetrahydrofuran acetone isopropyl acetate most volatile: least volatile: 90 tetrahydrofuran: acetone: isopropyl acetate: more less the same choose one choose one пос пос [°℃

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According to this phase diagram, the normal boiling point of the substance in degree Celsius is:     100     114     0.118     184