Chapter 8.2, Problem 8.2.3SR

Interpretation Introduction

Interpretation:

The empirical formula and the molecular formula of a hydrocarbon should be identified from the given options when the combustion of given hydrocarbon produces $\text{2}\text{.70g}$ of ${\text{H}}_{\text{2}}\text{O}$ and $\text{6}\text{.59g}$ of ${\text{CO}}_{\text{2}}$.

Concept introduction:

• Combustion of hydrocarbon produces ${\text{CO}}_{\text{2}}$ and ${\text{H}}_{\text{2}}\text{O}$.
• Number of moles of a substance, from its given mass is,

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

• Empirical formula of a compound represents the smallest whole number relative ratio of elements in that compound.
• Equation for finding Molecular formula from the empirical formula,

$\frac{\text{Molar}\text{mass}}{\text{Empirical}\text{formula mass}}\times \text{ Empirical formula}$