Chapter 15, Problem 15.13P

Interpretation Introduction

Interpretation:

Molecules among ${\text{Cl}}_{\text{2}}$, ${\text{F}}_{\text{2}}$, $\text{ClF}$ and ${\text{NF}}_3$ that have polar interactions have to be determined.

Concept Introduction:

Molecules of liquid and solid are held together by a force of attraction. The value of enthalpy of vaporization and sublimation reflects the magnitude of force between the molecules. Greater the value of $\Delta H_{\text{vap}}$ or $\Delta H_{\text{sub}}$, greater will be the force of attraction between the molecules.

Molecules that have a dipole moment are polar in nature. Polarity or dipole moment is result of electronegativity differences among elements. Dipole moment is shown by an arrow with tail towards electropositive element and arrow head towards electronegative atom.