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Which of the following gases cannot be liquefied at 25°C? a. C,H6, critical temperature 562 K b. NH3, critical temperature 405 K c. CO2, critical temperature 304 K d. Cl2, critical temperature 419 K e. O,, critical temperature 155 K

Which of the following gases cannot be liquefied at 25°C? a. C,H6, critical temperature 562 K b. NH3, critical temperature 405 K c. CO2, critical temperature 304 K d. Cl2, critical temperature 419 K e. O,, critical temperature 155 K

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Please help me with questions 29 & 30. Thank you in advance

29. Which of the following gases cannot be liquefied at 25°C? a. C,H6, critical temperature 562 K b. NH3, critical temperature 405 K c. CO2, critical temperature 304 K d. Cl2, critical temperature 419 K e. O2, critical temperature 155 K 30. The critical temperature and pressure of CO2 are 31°C and 73 atm. Which of the following is true? a. At 31°C, CO2 cannot be liquefied no matter how great the pressure b. At 31°C, CO2 can be solidified at 150 atm c. At 31°C, CO2 can be liquefied at pressures below 73 atm d. At 31°C, CO2 can be liquefied at pressures greater than 73 atm e. At 31°C, CO2 exists as an equilibrium mixture of solid, liquid and vapor 31. The phase diagram for a pure substance is given below. 300 250 + Liquid 200 Pressure, 150 + atm Solid 100 Vapor 50 100 200 300 400 Temperature, K What is the lowest temperature at which liquid can exist? b. 0 K a. 150 K с. 250 K d. 400 K е. 200 K 32. The following unit cell is the b. hexagonally close-packed unit cell d. primitive cubic unit cell a. face-centered cubic unit cell c. body-centered cubic unit cell e. coordination number 8 cubic unit cell
Transcribed Image Text:29. Which of the following gases cannot be liquefied at 25°C? a. C,H6, critical temperature 562 K b. NH3, critical temperature 405 K c. CO2, critical temperature 304 K d. Cl2, critical temperature 419 K e. O2, critical temperature 155 K 30. The critical temperature and pressure of CO2 are 31°C and 73 atm. Which of the following is true? a. At 31°C, CO2 cannot be liquefied no matter how great the pressure b. At 31°C, CO2 can be solidified at 150 atm c. At 31°C, CO2 can be liquefied at pressures below 73 atm d. At 31°C, CO2 can be liquefied at pressures greater than 73 atm e. At 31°C, CO2 exists as an equilibrium mixture of solid, liquid and vapor 31. The phase diagram for a pure substance is given below. 300 250 + Liquid 200 Pressure, 150 + atm Solid 100 Vapor 50 100 200 300 400 Temperature, K What is the lowest temperature at which liquid can exist? b. 0 K a. 150 K с. 250 K d. 400 K е. 200 K 32. The following unit cell is the b. hexagonally close-packed unit cell d. primitive cubic unit cell a. face-centered cubic unit cell c. body-centered cubic unit cell e. coordination number 8 cubic unit cell
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