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Ideal Gases

Ideal Gases. 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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Ideal Gases

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  1. Ideal Gases 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 rigid tank contains CO2 at 2 atm and 50°C. When the tank is heated to 250°C, the pressure increases significantly and the gas density ____________. increases decreases remains the same Gas

  3. The pressure of an ideal gas in a fixed volume container is doubled without changing the number of moles of the gas. The average velocity of the particles should __________. not change be doubled be halved be quadrupled none of the above

  4. An ideal gas (water) enters a compressor, and the exiting water is a real fluid. The shaft work will be ____________ that obtained if the exiting water could be considered an ideal gas. higher than lower than the same as

  5. 1 mol CH4 (1 bar, 50°C) is mixed with 1 mol O2 (1 bar, 50°C) to form a mixture at 2 bar and 50°C. Assume ideal gases. The Gibbs free energy change is _____________. positive negative zero Need more information

  6. Which system has the highest internal energy if one mole of the same ideal gas is in each piston-cylinder? A B Both have the same internal energy A B 2 atm 50°C 10 atm 50°C

  7. N2 A constant-volume tank contains CO2 at 2 atm. Nitrogen is injected into the tank. If the CO2 all remains in the tank, its partial pressure ____________. Assume ideal gases and an isothermal system. decreases increases stays the same CO2

  8. A constant-volume tanks contains 4 mol CO2 and 1 mol N2 at a total pressure of 2 atm. The N2 is removed completely through a membrane that allows only N2 to permeate. If all the CO2 remains in the tank, the partial pressure of CO2 ___________. Assume ideal gases and an isothermal system. decreases increases stays the same membrane N2 CO2 +N2

  9. An ideal gas is at 1 atm in a piston-cylinder. The piston is weightless and frictionless. When the mass is removed from the piston, the gas temperature ____________. increases decreases remains the same Stopper Vacuum Weight 1 kg Piston Gas

  10. 1 mol CO2 and 2 mol N2are heated at constant pressure. The partial pressure of the CO2 _________. Assume ideal gases. increases decreases stays the same 1 kg 1 kg CO2 N2 1 mol CO2 2 mol N2 1 mol CO2 2 mol N2 After heating Start

  11. 1 mol CO2 and 2 mol N2 are in a container at 100°C. The container is then placed in an ice bath at constant pressure. The partial pressure of the CO2 _________. Assume ideal gases. increases decreases stays the same 1 kg Weight Piston 1 kg Gas Gas Start After cooling

  12. A fixed volume tank has water in VLE. A mole of air was added to the system. All gases are ideal. The amount of liquid water ___________. increases decreases stays the same Vapor 1 mol air Liquid

  13. A fixed-volume tank contains CO2and N2, both of which are ideal gases. One mole of O2, also an ideal gas, is added. The partial pressure of H2 __________. increases decreases stays the same PCO2 = 0.6 atm PN2 = 0.5 atm 1 mol O2

  14. A gas is heated and expands in a sealed, frictionless, piston-and cylinder arrangement, where the piston mass and the atmospheric pressure above the piston remain constant. The pressure of the gas will _________. increase   remain the same   decrease   Insufficient information   1 kg 1 kg Gas Gas 1 mol CO2 2 mol N2 Start After heating

  15. Which line corresponds to an isotherm? D A E B Pressure C Volume

  16. H H H H H yi yi yi yi yi Which is the correct plot of enthalpy vs. mole fraction of one component for a binary mixture of ideal gases? A B C D E

  17. G G G G G yi yi yi yi yi Which is the correct plot of Gibbs free energy vs. yi for a binary mixture of ideal gases? A B C D E

  18. A membrane divides a rigid, well-insulated 2 m3 tank into equal parts. The left side contains an ideal gas (Cp= 30 J/mol K) at 300 K and 10 bar and the right side is a vacuum. If the membrane ruptures, what will be the final temperature of the gas? 200 K 300 K 400 K Need more information Vacuum Gas Membrane

  19. A rigid isolated vessel is divided by a barrier into two chambers of equal volume. One side contains an ideal monatomic gas, the other side contains vacuum. If the barrier is removed, the temperature of the gas will __________. double be cut in half not change go to absolute zero Vacuum Ideal monotomic gas Piston Remove Stoppers

  20. A rigid vessel is divided by a barrier into two chambers of equal volume. One side contains a real gas, the other side contains vacuum. If the barrier is removed, the temperature of the gas will _____________. go to absolute zero increase decrease not change Vacuum Real gas Piston Remove Stoppers

  21. What is ∆U when N2 and O2 (ideal gases) are mixed at constant pressure? Positive Negative Zero

  22. Does energy have to be added to a mixture of N2 and O2 (ideal gases) to separate them at constant pressure? Yes, add energy No, remove energy No energy exchange is needed

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