Chapter 8, Problem 8.20NP

Interpretation Introduction

Interpretation: The normal and standard boiling point of benzene needs to be determined, if the vapor pressure of liquid benzene is 20170 Pa at 298.15 K and ${\text{ΔH}}_{vap}$ is 30.72 kJ/mol at 1 atm pressure.

Concept Introduction: All substances can mainly exist in three phases; solid, liquid and gas. These three phases can convert into each other by the application of temperature and pressure such as heating of solid leads to the conversion to liquid and then gaseous state of matter.

Similarly, the gases can be compressed at high pressure to liquefy. The enthalpy change during the fusion of solid to liquid is called as enthalpy of fusion that is denoted as ${\text{ΔH}}_{\text{fus}}$ . Similarly, the enthalpy of vaporization involves in the vaporization of liquid to gas is called an enthalpy of vaporization that is denoted as ${\text{ΔH}}_{\text{vap}}$ .