Chapter 8, Problem 8.25NP

Interpretation Introduction

Interpretation:

The boiling point for water at a pressure of 253 torr needs to be calculated given ΔH_vapis 40.656 kJ/mol at 373.12 K

Concept Introduction:

The relationship between pressure (P) and temperature (T) at different initial and final conditions are related to the enthalpy of vaporization (ΔH) via the Clausius-Clapeyron equation:

  $\text{ln}\frac{{\text{P}}_{\text{2}}}{{\text{P}}_{\text{1}}}\text{ = }\frac{-{\text{ΔH}}_{\text{vap}}}{\text{R}}\left(\frac{\text{1}}{{\text{T}}_{\text{2}}}-\frac{1}{T_1}\right)\text{ -----(1)}$

Here, P₁ and P₂ are the initial and final pressures

T₁ and T₂ are the initial and final temperatures

R = 8.314 J/mol-K