Chapter 8, Problem 8.21QP

Interpretation Introduction

Interpretation:

The empirical formula and the molecular formula for the given amount of para-dichlorobenzene should be identified when the combustion of given $\text{1}\text{.68 g}$ of sample produces $\text{0}\text{.412g}$ of ${\text{H}}_{\text{2}}\text{O}$ and $\text{3}\text{.02g}$ of ${\text{CO}}_{\text{2}}$.

Concept Introduction:

• Combustion of hydrocarbon produces ${\text{CO}}_{\text{2}}$ and ${\text{H}}_{\text{2}}\text{O}$.
• Combustion is the process of burning a compound in presence of excess of oxygen.
• Empirical formula of a compound represents the smallest whole number relative ratio of elements in that compound.
• Molecular Formula for a compound represents the individual number and the type of atoms present in the compound.
• Number of moles of a substance, from its given mass is,

$\text{Number of moles}\text{=}\frac{\text{Given}\text{mass}}{\text{Molecular}\text{mass}}$