Chapter 11, Problem 11.33SP

Interpretation Introduction

Interpretation:

The heat of vaporization $\left(\Delta H_{\text{vap}}\right)$ for mercury from the plot is to be calculated.

Concept introduction:

Clausius-Clapeyron equation is used to determine the vapor pressure at another temperature if vapor pressure at one temperature and enthalpy of vaporization is known.

The expression of Clausius-Clapeyron equation is as follows:

$\ln P_{\text{vap}}=\left(\frac{-\Delta H_{\text{vap}}}{\text{R}}\right)\left(\frac{1}{T}\right)+C$

Where,

• $P_{\text{vap}}$ is the vapor pressure.
• $\Delta H_{\text{vap}}$ is the heat of vaporization.
• $T$ is the temperature.
• $C$ is the constant.
• $\text{R}$ is universal gas constant.