Chapter 9, Problem 105QRT

(a)

Interpretation Introduction

Interpretation:

The areas for the pure solid, liquid and gas phases have to be labeled.

Concept Introduction:

Every pure substance that exists in all three phases has a characteristic phase diagram like below.

Figure 1

(b)

Interpretation Introduction

Interpretation:

A point on the diagram at which red phosphorus liquid and vapor are in equilibrium has to be labeled.

Concept Introduction:

Refer part (a).

(c)

Interpretation Introduction

Interpretation:

The reason why the solid red phosphorus cannot be melted in a container open to the atmosphere has to be explained.

(d)

Interpretation Introduction

Interpretation:

All the phase changes that occur sequentially when conditions change from point $B$ to point $A$ has to be identified.

Concept Introduction:

The temperature at which the vapour pressure of the liquid equals to the atmospheric pressure on the surface of the liquid is known as the boiling point.