Chapter 11, Problem 33QP

Interpretation Introduction

Interpretation:

The molar heat of vaporization of a liquid is to be estimated.

Concept introduction:

The relationship between vapour pressure and temperature is given by Clausius Clapeyron equation as follows:

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

Here, $\Delta {\text{H}}_{vap}$ is the molar heat of vaporization, $\text{R}$ is the gas constant, $P_1\&P_2$ are the vapour pressures, and $T_1\&T_2$ are the temperatures.

To convert a temperature from degree Celsius to Kelvin, the expression is as follows:

${\text{K = }}^{\text{o}}\text{C}+273$

Here, $\text{K}$ is the temperature in Kelvin, ${}^{\text{o}}\text{C}$ is the temperature in Celsius.