Chapter 7, Problem 7.2NP

(a)

Interpretation Introduction

Interpretation:

The values for Van der Waals parameters a, b, and R from z_c, T_c, P_c and V_c should be calculated.

Concept Introduction :

The Universal gas constant can be calculated from z_c, T_c, P_c and V_c as follows:

  $R=\frac{V_c{P}_c}{z_c{T}_c}$

Also, the constants a and b can be calculated as follows:

  $b=\frac{R{T}_c}{8P_c}$

  $a=\frac{27R^2{T}_c^2}{64P_c}$

Here, R − universal gas constant

V_c − critical volume

P_c − critical pressure

T_c − critical temperature

(b)

Interpretation Introduction

Interpretation:

The Van der Waals parameters a and b should be calculated using the critical constants for water and correct value for R.

Concept Introduction :

The constants a and b can be calculated as follows:

  $b=\frac{R{T}_c}{8P_c}$

  $a=\frac{27R^2{T}_c^2}{64P_c}$

Here, R − universal gas constant

V_c − critical volume

P_c − critical pressure

T_c − critical temperature