15. Which one of the following noble gas elements will have the lowest critical point temperature? а. Ar b. Ne с. Kr d. Rn e. Xe 16. Which one of the following cannot be liquefied by compression at a temperature of 25.0°C? a. C,H4, critical point data: 9.9°C, 50.5 atm b. CH3CI, critical point data: 144.0°C, 66.0 atm c. CH2, critical point data: 35.5°C, 61.6 atm d. C2H6, critical point data: 32.2°C, 48.2 atm e. SO2, critical point data: 158.0°C, 78.0 atm

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I need help with 15 & 16 please and thank you.

**Use the following for #11 and #12:**

Consider the following substances and their normal boiling points, in °C:
- C: 43.8°C
- D: 93.7°C
- M: 56.7°C
- T: 83.5°C
- R: 63.6°C

**11.** Which set below correctly lists some of these substances in order of *decreasing* vapor pressure at 20°C?
- a. C > R > D
- b. D > T > R
- c. R > M > D
- d. C > D > M
- e. D > R > M

**12.** Which set below correctly lists some of these liquids in order of *increasing* intermolecular forces at 20°C?
- a. C < R < D
- b. D < T < R
- c. R < T < C
- d. C < D < M
- e. D < R < M

**13.** Given the phase changes: condensation, deposition, crystallization, fusion, sublimation, vaporization. Which (set) of these phase changes is (are) endothermic?
- a. deposition, condensation, and crystallization *only*
- b. fusion *only*
- c. fusion and vaporization *only*
- d. fusion, deposition, and sublimation *only*
- e. sublimation, fusion, and vaporization *only*

**14.** The *critical temperature* of a substance is:
- a. always higher than the triple point temperature
- b. the temperature below which it cannot exist in the liquid state
- c. the temperature which is always higher than the Kelvin point
- d. the temperature below which it cannot be liquefied by increasing the pressure
- e. the temperature below which it cannot be supercooled

**15.** Which one of the following noble gas elements will have the *lowest* critical point temperature?
- a. Ar
- b. Ne
- c. Kr
- d. Rn
- e. Xe

**16.** Which one of the following *cannot* be liquefied by compression at a temperature of 25.0°C?
- a. C₂H₄, critical point data: 9.9°C, 50.5 atm
Transcribed Image Text:**Use the following for #11 and #12:** Consider the following substances and their normal boiling points, in °C: - C: 43.8°C - D: 93.7°C - M: 56.7°C - T: 83.5°C - R: 63.6°C **11.** Which set below correctly lists some of these substances in order of *decreasing* vapor pressure at 20°C? - a. C > R > D - b. D > T > R - c. R > M > D - d. C > D > M - e. D > R > M **12.** Which set below correctly lists some of these liquids in order of *increasing* intermolecular forces at 20°C? - a. C < R < D - b. D < T < R - c. R < T < C - d. C < D < M - e. D < R < M **13.** Given the phase changes: condensation, deposition, crystallization, fusion, sublimation, vaporization. Which (set) of these phase changes is (are) endothermic? - a. deposition, condensation, and crystallization *only* - b. fusion *only* - c. fusion and vaporization *only* - d. fusion, deposition, and sublimation *only* - e. sublimation, fusion, and vaporization *only* **14.** The *critical temperature* of a substance is: - a. always higher than the triple point temperature - b. the temperature below which it cannot exist in the liquid state - c. the temperature which is always higher than the Kelvin point - d. the temperature below which it cannot be liquefied by increasing the pressure - e. the temperature below which it cannot be supercooled **15.** Which one of the following noble gas elements will have the *lowest* critical point temperature? - a. Ar - b. Ne - c. Kr - d. Rn - e. Xe **16.** Which one of the following *cannot* be liquefied by compression at a temperature of 25.0°C? - a. C₂H₄, critical point data: 9.9°C, 50.5 atm
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