Chapter 4, Problem 4.11P

Interpretation Introduction

Interpretation:

The latent heat of vaporization at -16 ^oC should be calculated and the calculated value should be compared with the enthalpy values from the table.

Concept Introduction:

Latent heat of vaporization, $\Delta H$, can be calculated as follows:

  $\Delta H=T\Delta V\frac{dP}{dT}$

dP/dT = Average change of pressure to the change of temperature (Calculated from slope)

  $\Delta V$ = Change in Volume

T = Temperature = -16 o C

We can find the value of slope by finding corresponding values of T and P from the tables.

Substituting those values in the equation above and converting units from ft³.psia to BTU and compare with the table values which are given in BTU