Chapter 21, Problem 120IL

Interpretation Introduction

Interpretation: To give the empirical and molecular formula for A and B and draw the Lewis structure for A.

Concept introduction:

The reaction of ${\text{PCl}}_{\text{5}}$ and ${\text{NH}}_{\text{4}}\text{Cl}$ results in evolution of hydrochloric acid. The mixture has to be heated at a temperature of $145°\text{C}$ for six hours. The products formed are found to have the same elemental composition but different molar masses.

Empirical formula of a compound is the smallest integer ratio of numbers of each element presented in that compound.

Molecular formula of a compound is integer multiple of empirical formula, the integer is depend upon the mass of empirical formula and the molecular mass of the compound.

Lewis structures are diagrams that represent the chemical bonding of covalently bonded molecules and coordination compounds.

It is also known as Lewis dot structures which represent the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule.