Chapter 23, Problem 23.2P

Interpretation Introduction

Interpretation:

$\Delta S_{fus}\text{ and }\Delta S_{vap}$ for $HF,\text{ HCl, HBr and HI}$ has to be calculated.

Concept Introduction:

Molar entropy of fusion of a substance $\left(\Delta S_{fus}\right)$ can be determined from its molar enthalpy of fusion $\left(\Delta H_{fus}\right)$ and melting point (in kelvin) T_m using the given formula,

  $\Delta S_{fus}\text{ = }\frac{\Delta H_{fus}}{T_m}$

Molar entropy of vaporization of a substance $\left(\Delta S_{vap}\right)$ can be determined from its molar enthalpy of vaporization $\left(\Delta H_{vap}\right)$ and boiling point (in kelvin) T_b using the given formula,

  $\Delta S_{vap}\text{ = }\frac{\Delta H_{vap}}{T_b}$