Chapter 7, Problem 7.89E

(a)

Interpretation Introduction

Interpretation:

The dew point line(s) from the given graphs is to be identified.

Concept introduction:

The formula to calculate the total pressure of the system with respect to the mole fraction in solution is,

$p{tot}_{}=\frac{p_1^{\ast }{p}_2^{\ast }}{p_1^{\ast }+\left(p_2^{\ast }-p_1^{\ast }\right)y_1}$

Where,

• $p_1^{\ast }$ is the vapor pressure of first component.

• $p_2^{\ast }$ is the vapor pressure of second component.

• $y_1$ is the mole fraction in vapor phase.

The plot between the vapor mole fraction and total pressure give the dew point line.

(b)

Interpretation Introduction

Interpretation:

The bubble point line(s) from the given graphs is to be identified.

Concept introduction:

The formula to calculate the total pressure of the system with respect to the mole fraction in solution is,

$p{tot}_{}=\frac{p_1^{\ast }{p}_2^{\ast }}{p_1^{\ast }+\left(p_2^{\ast }-p_1^{\ast }\right)y_1}$

Where,

• $p_1^{\ast }$ is the vapor pressure of first component.

• $p_2^{\ast }$ is the vapor pressure of second component.

• $y_1$ is the mole fraction in vapor phase.

The plot between the liquid mole fraction and total pressure give the bubble point line.

(c)

Interpretation Introduction

Interpretation:

The fractional distillation of a $50:50$ mole ratio of benzene and $\text{1, 1-dichloroethane}$ is to be stated. The theoretical plates are to be drawn. The composition of the initially distilled product is to be predicted.

Concept introduction:

The formula to calculate the total pressure of the system with respect to the mole fraction in solution is,

$p{tot}_{}=\frac{p_1^{\ast }{p}_2^{\ast }}{p_1^{\ast }+\left(p_2^{\ast }-p_1^{\ast }\right)y_1}$

Where,

• $p_1^{\ast }$ is the vapor pressure of first component.

• $p_2^{\ast }$ is the vapor pressure of second component.

• $y_1$ is the mole fraction in vapor phase.