Chapter 11.2, Problem 1PPB

Interpretation Introduction

Interpretation:

The molar heat of vaporization of a liquid is to be estimated whose vapor pressure doubled when temperature is raised within a given limit and determine the temperature at which the vapor pressure will befive times the value at ${\text{85}}^{\circ }\text{C}$.

Concept introduction:

The relationship between the vapor pressure and temperature is given by the Clausius Clapeyron equation as:

$\log \left(\frac{P_1}{P_2}\right)=\frac{\Delta {\text{H}}_{vap}}{\text{R}}\left(\frac{1}{T_2}-\frac{1}{T_1}\right)$.

Here, $\Delta {\text{H}}_{vap}$ is the molar heat of vaporization, $\text{R}$ is the gas constant, $P_1\text{ and }{P}_2$ are the vapor pressures, and $T_1\text{ and }{T}_2$ are the temperatures.