Chapter 4, Problem 4A.1P

(a)

Interpretation Introduction

Interpretation: The phases present in a sample of ${\text{CO}}_{\text{2}}$ which is heated steadily from $\text{100}\text{K}$ at constant pressure of $\text{1}\text{atm}$ have to be described.

Concept introduction: The physical state of a substance under different conditions of temperature and pressure is represented by a phase diagram which is drawn by taking pressure on the y axis and temperature on the x axis.  One component system is a system involving one pure substance in different phases.  The system is defined by a set of variables and the minimum number of variable used to define the system is called its degree of freedom.

(b)

Interpretation Introduction

Interpretation: The phases present as a sample of ${\text{CO}}_{\text{2}}$ is heated steadily from $\text{100}\text{K}$ at constant pressure of $70\text{atm}$ have to be described.

Concept introduction: The physical state of a substance under different conditions of temperature and pressure is represented by a phase diagram which is drawn by taking pressure on the y axis and temperature on the x axis.  One component system is a system involving one pure substance in different phases.  The system is defined by a set of variables and the minimum number of variable used to define the system is called its degree of freedom.