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PSall - Page 1 of 6 CHEMISTRY 123 Problem Set#1 Phase...

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CHEMISTRY 123 Problem Set #1 Phase Equilibria 1 20. Below is the phase diagram for phenol, which has two solid phases, S I and S II , both more dense than the liquid. The transition S I S II is exothermic. For questions 1 6 and 11 20 use: (1) vapour or gas (2) liquid (3) solid S I (4) solid S II 1. Which phase is stable in region A? 2. Which phase is stable in region D? 3. Which phases are stable at 61 atm and 64 °C? 4. Which phases are in equilibrium at 2000 atm and 64 °C? 5. Which phases are in equilibrium at 3 × 10 3 atm and 40 °C? 6. Which phase is the most dense? 7. Which phase is more dense: B or C? (1) B (2) C 8. The normal boiling point is: (1) 40 °C (2) 64 °C (3) 420 °C (4) none of these 9. The critical temperature is: (1) 40 °C (2) 64 °C (3) 420 °C (4) none of these 10. The transition S I liquid is exothermic. (1) True (2) False 11. A tube is half filled with solid phenol, then the air is removed and the tube sealed. It is kept at a constant temperature of 35 °C, and the phenol comes to equilibrium. What phases are present in the tube at equilibrium? Page 1 of 6
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Identify the phase(s) present in each of the numbered regions on the following graphs. 12 16. Isotherm of phenol at 50 °C 17 20. Isobaric heating curve for phenol at 1 atm Page 2 of 6
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21. A substance has the following properties: boiling point = 75 °C and melting point = –15 °C. Sketch a heating curve for the substance from –50 °C to 100 °C in the diagram shown below. Clearly label the phases present at each individual step (five steps). Time [min] T [K] 373 223 273 22 30. For H 2 O, the normal boiling point is 100 °C; the normal melting point is 0 °C; the triple point is at 0.0098 °C and 0.006 atm; the critical point is at 374 °C and 220 atm. Only three phases are present at the temperatures and pressures shown on the graph. T(°C) P(atm) 220 1.0 0.006 0.0 0.0098 100 374 Page 3 of 6
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