Chapter 15, Problem 15.22P

Interpretation Introduction

Interpretation:

The atmospheric pressure when water boils at $93\text{°C}$ has to be determined.

Concept Introduction:

If $P_1$ and $P_2$ are the vapor pressures at two temperatures $T_1$ and $T_2$ then they are related by Clausius-Clapeyron Equation as follows:

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

If enthalpy of vaporization and vapor pressure at one temperature is known then this equation can be used to estimate the vapor pressure at other temperature.