. Visualize a substance with the following points on the phase diagram: a triple point at 0.05 atm and 150 K; a normal melting point at 175 K; a normal boiling point at 350 K; and a critical point at 2.0 atm and 450 K. The solid liquid line is “normal” (meaning positive sloping). For this, complete the following: a. Roughly sketch the phase diagram, using units of atmosphere and Kelvin. Label the area 1, 2, and 3, and points T and C on the diagram. b. Describe what one would see at pressures and temperatures above 2.0 atm and 450 K. c. Describe the phase changes from 50 K to 250 K at 1.5 atm. d. What exists in a system that is at 1 atm and 350 K? e. What exists in a system that is at 1 atm and 175 K?
1. Visualize a substance with the following points on the phase diagram: a triple
point at 0.05 atm and 150 K; a normal melting point at 175 K; a normal boiling point
at 350 K; and a critical point at 2.0 atm and 450 K. The solid liquid line is “normal”
(meaning positive sloping). For this, complete the following:
a. Roughly sketch the phase diagram, using units of atmosphere and Kelvin. Label
the area 1, 2, and 3, and points T and C on the diagram.
b. Describe what one would see at pressures and temperatures above 2.0 atm
and 450 K.
c. Describe the phase changes from 50 K to 250 K at 1.5 atm.
d. What exists in a system that is at 1 atm and 350 K?
e. What exists in a system that is at 1 atm and 175 K?
2. Based from the phase diagrams of water and carbon dioxide, answer the
following questions and justify your answers: 1. You have ice at 263 K (-10.0 oC)
and 1.0 atm. What could you do to make the ice sublime? 2. A sample of dry ice
(solid CO2) is cooled to 173 K (-100.0 oC), and is set on a table at room temperature
(298 K; 25 oC). At what temperature is the rate of sublimation and deposition the
same (assume that pressure is held constant at 1 atm)?
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