Chapter 9.8, Problem 14P

A)

Interpretation Introduction

Interpretation:

The partial molar enthalpy of water when $x_1=0.4$ has to be determined.

Concept introduction:

The partial molar enthalpy for water:

${\overline{H}}_2=\underset{\_}{H}-x_1\frac{d\underset{\_}{H}}{d{x}_1}$

Here, enthalpy of mixture is $\underset{\_}{H}$.

B)

Interpretation Introduction

Interpretation:

The partial molar enthalpy of water when $x_1=0$ has to be determined.

Concept introduction:

The partial molar enthalpy of water from equation (4)

${\overline{H}}_2=-1,850-26,800x_1^2$