Chapter 9, Problem 74QAP

Interpretation Introduction

(a)

Interpretation:

The compound(A,B or C) which has weakest forces between molecules should be identified from the given vapor pressure curves of the molecule.

Concept introduction:

The vapor pressure curveis the curve of temperature and vapor pressure of compound. The compound which vaporizes easily has weakest force of attraction.

Interpretation Introduction

(b)

Interpretation:

The compound (A, B, and C) which has a normal boiling point at about ${15}^0\text{C}$ should be identified from the given vapor pressure curves of the molecule.

Concept introduction:

The way to find out normal boiling point is drawing of horizontal line from left at the standard pressure.

Interpretation Introduction

(c)

Interpretation:

The temperature at which B will boil if the atmospheric pressure is $500\text{mm}\text{Hg}$ should be determined from the given vapor pressure curves of the molecule.

Concept introduction:

The intersection point of curve B and horizontal line is the temperature at which B boils.

Interpretation Introduction

(d)

Interpretation:

The physical state of A at ${\text{25}}^{\text{0}}\text{C}$ and $\text{400}\text{mm}$ Hg should be identified from the given vapor pressure curves of the molecule.

Concept introduction:

The intersection point of ${\text{25}}^{\text{0}}\text{C}$ and $\text{400}\text{mm}$ Hg is right of curve of A. Any point on the right of curve A is gas.

Interpretation Introduction

(e)

Interpretation:

The pressure at which C will boil at ${\text{40}}^{\text{0}}\text{C}$ should be determined from the given vapor pressure curves of the molecule.

Concept introduction:

The intersection point of curve C at ${\text{40}}^{\text{0}}\text{C}$ with horizontal line indicates the pressure.