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Phase Equilibrium: Single Condensable Component Part 1

Phase Equilibrium: Single Condensable Component Part 1. Contributions by: John L. Falconer & Will Medlin Department of Chemical and Biological Engineering University of Colorado Boulder, CO 80309-0424 Supported by the National Science Foundation.

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Phase Equilibrium: Single Condensable Component Part 1

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  1. Phase Equilibrium:Single Condensable ComponentPart 1 Contributions by: John L. Falconer & Will MedlinDepartment of Chemical and Biological EngineeringUniversity of ColoradoBoulder, CO 80309-0424 Supported by the National Science Foundation

  2. A container has liquid water (50% of the volume) andwater vapor (50% of the volume) in equilibrium. It is sealed so the volumeis fixed. When the temperature is raised, the ___________. liquid evaporates and the pressure increases vapor condenses and the pressure increases liquid and vapor both remain and pressure increases Vapor Water

  3. Liquid water is in VLE at 1.2 bar with water vapor and air in a piston-cylinder. Half the air is removed through a selective membrane; no water leaves. Pressure and temperature are constant. What happens? All of the water vaporizes All of the water condenses Some of the water vaporizes Some of the water condenses 1 kg Vapor/air 1.2 bar Air Water

  4. Liquid water is in VLE at 1.2 bar with water vapor and air in a piston-cylinder. All the air is removed through a selective membrane and half the water vapor is also removed. Pressure and temperature are constant. What happens? All of the water vaporizes All of the water condenses Some of the water vaporizes Some of the water condenses 1 kg Vapor 1.2 bar Air Water Vapor Water

  5. Liquid water is in VLE at 1.2 bar with water vapor and air in a piston-cylinder. Half the air and halfthe water vapor are removed. Pressure and temperature are constant. What happens? All of the water vaporizes All of the water condenses Some of the water vaporizes Some of the water condenses No water vaporizes 1 kg Vapor 1.2 bar Air Water Vapor Water

  6. Liquid water is in VLE at 1.2 bar with water vapor and air in a fixed-volume container. Half the air is removed through a selective membrane; no water leaves. Temperature is constant. What happens? All of the water vaporizes All of the water condenses Some of the water vaporizes Some of the water condenses No water changes phase Vapor 1.2 bar Air Water

  7. Liquid water is in equilibrium at 50°C with air in a piston-cylinder at 1 bar. The pressure is isothermally raised to 2 bar by pushing down on the piston. The amount of water in the vapor phase __________. increases decreases remains the same Not enough information Vapor Water

  8. Liquid water is in equilibrium at 50°C with air in a piston-cylinder at 1 bar. The pressure is isothermally raised to 2 bar by pushing down on the piston. The water partial pressure ________. increases decreases remains the same Not enough information Vapor Water

  9. A piston-cylinder at 45°C and 0.5 bar contains hexane in vapor-liquid equilibrium. You push down on the piston until the vapor volume is half its original volume. The system is at constant temperature. What is the pressure at the new equilibrium? 0.25 bar 0.5 bar 1.0 bar Cannot be determined Hexane Vapor Hexane Liquid

  10. Liquid water is in equilibrium at 50°C with air in a piston-cylinder at 1 bar. The temperature is lowered to 40°C. The partial pressure of the air ___________. increases decreases remains the same Not enough information 1 kg Vapor Water

  11. Liquid water is in equilibrium at 50°C with air in a piston-cylinder at 1 bar. The temperature is lowered to 40°C. What happens to the water vapor? Some of it condenses All of it condenses None of it condenses More water evaporates 1 kg Vapor Water

  12. A piston and cylinder at 45oC and below atmospheric pressure contains 0.9 mol of n-hexane liquid and 0.1 mol of n-hexane vapor in equilibrium. Weights areremoved from the piston to decrease the pressure to 99% of its original value at constant temperature. What happens? Some of the liquid evaporates Most of the liquid evaporates All the liquid evaporates All the vapor condenses Some of the vapor condenses 1 kg Vapor Liquid

  13. Liquid water is in equilibrium at 50°C with air in a fixed-volume container at 1 bar. The temperature is lowered to 40°C. The partial pressure of the air ___________. increases decreases remains the same Not enough information Vapor 1 bar Water

  14. Liquid water is equilibrium with air in a fixed volume container at 1.2 bar. Half the air and half the water vapor are removed. Temperature is constant. What happens? All of the water vaporizes All of the water condenses Some of the water vaporizes Some of the water condenses No water changes phase Vapor 1.2 bar Water

  15. Liquid water is equilibrium with air in a fixed volume container at 1.2 bar. Half the air and half the water vapor are removed. Temperature is constant. The partial pressures of air and water __________. decrease increase remain the same Need more information. Vapor 1.2 bar Water

  16. Water is in VLE at 1.2 bar in a fixed-volume container. You inject 5 cm3 of air into the system, but keep the temperature constant. What happens? All of the water vaporizes All of the water condenses Some of the water vaporizes Some of the water condenses No water changes phase Vapor 1.2 bar Air Water

  17. Liquid water is in equilibrium at 50°C with air in a piston-cylinder at 1 bar. The temperature is raised to 60°C. What happens? Some liquid evaporates All liquid evaporates No liquid evaporates Some vapor condenses 1 kg Vapor Water

  18. Liquid water is in equilibrium at 50°C with air in a piston-cylinder at 1 bar. The temperature is raised to 60°C. The partial pressure of the air ______________. increases decreases remains the same Not enough information. 1 kg Vapor Water

  19. Liquid water is in equilibrium at 30°C with air in a piston-cylinder at 1 bar. The pressure is isothermally lowered to 0.85 bar by removing weights from the piston. The partial pressure of air ________. increases decreases remains the same Not enough information. 1 kg Vapor Water

  20. Liquid water is in equilibrium at 30°C with air in a piston-cylinder at 1 bar. The pressure is isothermally lowered to 0.85 bar by removing weights from the piston. The partial pressure of water ________. increases decreases remains the same Not enough information. 1 kg Vapor Water

  21. Liquid water is in equilibrium at 30°C with air in a piston-cylinder at 1 bar. The pressure is isothermally lowered to 0.85 bar by removing weights from the piston. What happens? Some of the water vaporizes. All of the water vaporizes. No water vaporizes. Not enough information. 1 kg Vapor Water

  22. A piston-cylinder contains liquid water in equilibrium with air at 1 bar and 40°C. You inject water vapor into the system and let it equilibrate to 40°C. What happens to the injected water? All of it condenses All of it stays in the vapor phase Some of it condenses 1 kg Water vapor Vapor Water

  23. A piston-cylinder contains liquid water in equilibrium with air at 1 bar and 40°C. You inject water liquid water into the system and let it equilibrate to 40°C. What happens to the injected water? All of it vaporizes All of it stays in the liquid phase Some of it vaporizes 1 kg Water Vapor Water

  24. Water is in VLE at 1.2 bar in a piston-cylinder. You inject 5 cm3 of air into the system, but keep pressure and temperature constant. What happens? All of the water vaporizes All of the water condenses Some of the water vaporizes Some of the water condenses 1 kg Air Vapor Water

  25. Water is in VLE at 1.2 bar in a piston-cylinder. The system contains 3 mol of liquid water. You inject 5 cm3 of air into the system at the same temperature. The system is adiabatic. What happens? All of the water vaporizes All of the water condenses Some of the water vaporizes Some of the water condenses Air Vapor Water 3.0 mol

  26. Water is in VLE at 1.2 bar in a piston-cylinder. The system contains 3 mol of liquid water. You inject 5 cm3 of air into the system at the same temperature. The system is adiabatic. The system temperature ____________. increases decreases remains the same Air Vapor Water 3.0 mol

  27. An insulated container of water is in VLE at 250°C. When the valve is opened at the top of the container, the pressure __________ and the ___________? stays the same; liquid level drops at constant temperature decreases; temperature drops decreases; temperature stays the same stays the same; temperature drops. Vapor Water

  28. An isothermal container of water is in VLE at 250°C. When the valve at the top of the container is opened to the atmosphere, the pressure __________ and the ___________? stays the same; liquid level drops at constant temperature decreases; temperature drops decreases; temperature stays the same stays the same; temperature drops. Vapor Water

  29. Liquid water is in VLE with air at 1.2 bar in a piston-cylinder. The vapor volume is 3 cm3. You inject 1 cm3 of air, but keep pressure and temperature constant. The mole fraction of air in the gas ________. increases decreases remains the same 1 kg Air Vapor Water 3.0 mol

  30. A fixed volume tank contains water in VLE. One mole of air is added to the system. All gases are ideal. The partial pressure of air ___________. increases decreases stays the same Air + H2O Vapor 1 mol Air Liquid H2O

  31. A fixed-volume tank contains liquid water and water vapor in VLE. One mole of air is added to the system. All gases are ideal. The partial pressure of water ____________. increases decreases stays the same Air + H2O Vapor 1 mol Air Liquid H2O

  32. PH2O PH2O PH2O PH2O Ptotal Ptotal Ptotal Ptotal This piston-cylinder contains air and water vapor (10% relative humidity). Which is the correct plot of partial pressure of water versus total pressure, as the total pressure on the gas increases? A B Air & Water Vapor (10% RH) D C

  33. This piston-cylinder contains air and water vapor (50% relative humidity). Which is the correct plot of partial pressure of water versus temperature, as the temperature decreases? 1 kg PH2O PH2O A B T T Air & Water Vapor (50% RH) PH2O PH2O C D T T

  34. A 500 cm3 fixed-volume container has air at 100°C and 1 bar. You inject 2 cm3 of liquid water that is at 25°C and let the system reach equilibrium at 100°C. What is the approximate final pressure? 1 bar 1.004 bar 1.05 bar 2 bar None of the above Air 100°C 1 bar Water 25°C

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