approximately 20 atm. Is there liquid CO, in the cylinder at room temperature (~20°C)? At 40°C? At -40°C? At -120°C? (b) Carbon dioxide is also sold as solid chunks, called dry jce in insulated containers. If the chunks are warmed by leaving them in an open container at room temperature, will they melt? (c) If a container is nearly filled with dry ice and then sealed and warmed to room temperature, will the dry ice melt? (d) If dry ice is compressed at a temperature below its triple point, will it melt?

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Answer b, c and d

(b) Carbon dioxide is also sold as solid chunks, called dry ice, in
12.22 Use Figure 12.8A, p. 361, to answer the following:
(a) Carbon dioxide is sold in steel cylinders under pressures of
approximately 20 atm. Is there liquid CO, in the cylinder at room
temperature (~20°C)? At 40°C? At -40°C? At-120°C?
ww.
insulated containers. If the chunks are warmed by leaving them in
an open container at room temperature, will they melt?
(c) If a container is nearly filled with dry ice and then sealed and
warmed to room temperature, will the dry ice melt?
(d) If dry ice is compressed at a temperature below its triple point,
will it melt?
Transcribed Image Text:(b) Carbon dioxide is also sold as solid chunks, called dry ice, in 12.22 Use Figure 12.8A, p. 361, to answer the following: (a) Carbon dioxide is sold in steel cylinders under pressures of approximately 20 atm. Is there liquid CO, in the cylinder at room temperature (~20°C)? At 40°C? At -40°C? At-120°C? ww. insulated containers. If the chunks are warmed by leaving them in an open container at room temperature, will they melt? (c) If a container is nearly filled with dry ice and then sealed and warmed to room temperature, will the dry ice melt? (d) If dry ice is compressed at a temperature below its triple point, will it melt?
12.2 Quantitative Aspects of Phase Changes
Critical point
(374 C, 218 atm)-
Line has negative-
slope:
liquid is denser
than solid.
Line has positive slope:
sold is denser than liquid.
Critical point
(31 C, 73 atm)
Meling
LIQUID
LIQUID
SOLID
Freezing
Vaporization
SOLID
Condensation
1.0-
Triple point
(0.01 C.0.006 atm)
GAS
1.0
blimation
Triple point
(57C, 5.1 atm)
Deposition
GAS
-78
31
-1
100
A CO2
Temperature ('C)
B H,0
Temperature ("C)
Figure 12.8 Phase diagrams for CO, and
H,0. (The slope of each solid-liquid ine o
exaggerated, and the axes are not linea
4. The critical point. Heat a liquid in a closed container and its density decreases At
the same time, more of the liquid vaporizes, so the density of the vapor increases. At the
critical point, the two densities become equal and the phase boundary disappears. The
temperature at the critical point is the critical temperature (T), and the pressure is the cri
cal pressure (P), The average E, is so high at this point that the vapor cannot be condenced
Pressure (atm)
Pressure (atm)
Transcribed Image Text:12.2 Quantitative Aspects of Phase Changes Critical point (374 C, 218 atm)- Line has negative- slope: liquid is denser than solid. Line has positive slope: sold is denser than liquid. Critical point (31 C, 73 atm) Meling LIQUID LIQUID SOLID Freezing Vaporization SOLID Condensation 1.0- Triple point (0.01 C.0.006 atm) GAS 1.0 blimation Triple point (57C, 5.1 atm) Deposition GAS -78 31 -1 100 A CO2 Temperature ('C) B H,0 Temperature ("C) Figure 12.8 Phase diagrams for CO, and H,0. (The slope of each solid-liquid ine o exaggerated, and the axes are not linea 4. The critical point. Heat a liquid in a closed container and its density decreases At the same time, more of the liquid vaporizes, so the density of the vapor increases. At the critical point, the two densities become equal and the phase boundary disappears. The temperature at the critical point is the critical temperature (T), and the pressure is the cri cal pressure (P), The average E, is so high at this point that the vapor cannot be condenced Pressure (atm) Pressure (atm)
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