Chapter 8, Problem 8.27NP

Interpretation Introduction

Interpretation: Thevapor pressure of ${\text{CH}}_{\text{3}}{\text{OH}}_{\left(\text{l}\right)}$ at 298.15 K needs to be determined, if He gas is added to the gas phase at a partial pressure of 200 bar.

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 ${\text{ΔH}}_{\text{fus}}$ . So, the enthalpy of vaporization involves in the vaporization of liquid to gas is called as enthalpy of vaporization that is denoted as ${\text{ΔH}}_{\text{vap}}$ .