   Chapter 12, Problem 37PS

Chapter
Section
Textbook Problem

Consider the phase diagram of CO2 in Figure 12.28. (a) Is the density of liquid CO2 greater or less than that of solid CO2? (b) In what phase do you find CO2 at 5 atm and 0 °C? (c) Can CO2 be liquefied at 45 °C?

(a)

Interpretation Introduction

Interpretation:

Density of the liquid carbon dioxide is greater or less than solid carbon dioxide has to be identified.

Concept introduction:

All three phases of CO2 exist simultaneously at the triple point.

CO2 forms a supercritical fluid at temperatures less than 31oC.

CO2 is a gas under normal conditions of temperature and pressure.

CO2 exists as a solid when the pressure is 4 atm and the temperature is more than -56.7oC.

Explanation

The phase diagram of CO2 is given below,

Figure 1

When seeing the phase diagram of CO2, the density

(b)

Interpretation Introduction

Interpretation:

Phase at which carbon dioxide at 5tm and 00C has to be determined.

Concept introduction:

All three phases of CO2 exist simultaneously at the triple point.

CO2 forms a supercritical fluid at temperatures less than 31oC.

CO2 is a gas under normal conditions of temperature and pressure.

CO2 exists as a solid when the pressure is 4 atm and the temperature is more than -56.7oC.

(b)

Interpretation Introduction

Interpretation:

Carbon dioxide can be liquefied at 450C or not has to be determined.

Concept introduction:

All three phases of CO2 exist simultaneously at the triple point.

CO2 forms a supercritical fluid at temperatures less than 31oC.

CO2 is a gas under normal conditions of temperature and pressure.

CO2 exists as a solid when the pressure is 4 atm and the temperature is more than -56.7oC.

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