Chapter 6, Problem 6.32E

Interpretation Introduction

Interpretation:

Whether the condition of phase transition in reusable hot-packs, which use the precipitation of super saturated sodium acetate or calcium acetate to give off heat of crystallization to warm a person, can be understood in terms of Clapeyron or the Clausius-Clapeyron equation is to be stated. The reason for the same is to be stated.

Concept introduction:

Clapeyron equation represents the relation between the change in pressure and temperature for all the phases involved to the change in entropies and molar volumes.

The Clausius-Clapeyron equation can be obtained from the rearrangement and integration of Clapeyron equation. The Clausius-Clapeyron equation is generally used for gas-phase equilibria, to predict the equilibrium temperatures and pressures and also for the determination of enthalpy for phase transition.