Chapter 4, Problem 4B.1P

Interpretation Introduction

Interpretation:

Work done by the water vapour and fraction of enthalpy of vaporization spent on expanding the vapour has to be predicted.

Concept Introduction:

Energy needed to transform the liquid state of a substance to its gaseous state is known as the enthalpy of vaporization of the system.  The formula for enthalpy of vaporization is shown below.

    $\Delta H_{\text{vaporization}}=\Delta U_{\text{vaporization}}+p\Delta V$

Where,

• • $\Delta H_{\text{vaporization}}$ is the enthalpy of vaporization.
• • $\Delta U_{\text{vaporization}}$ is the increase in the internal energy.
• • $p\Delta V$ is thework done against pressure.