Question

What is the empirical formula of propene? Of polypropene?

Answer 1

Hint: The empirical formula of a compound is the most straightforward positive number proportion of atoms present in a compound. The empirical formula is the least difficult type of representation. They give the most reduced entire number proportion between the components in a compound.

Complete step by step answer:
Before answering the question, let us see the difference between structural formula and empirical formula.
We have to understand that an empirical formula (similar to molecular formula) comes up short on any underlying data about the location or holding of atoms in a compound. It can in this way depict various structures, or isomers, with differing physical properties.
For example, let us take the case of butane and isobutane.
For butane and isobutane, the empirical formula for the two atoms is $C_2{H}_5$, and they share a similar molecular formula,$C_4{H}_{10}$ Nonetheless, one way of indicting butane is$$C{H}_{3}C{H}_{2}C{H}_{2}C{H}_3$$, while isobutane can be depicted utilizing the structural formula ${\left(C{H}_3\right)}_{3}CH$.
Now, let us write the empirical formula of propene and polypropene.
The empirical formula is the easiest entire number proportion that characterizes constituent atoms in a compound. If we somehow managed to get a sample of propylene of known mass, and combust it in the presence of oxygen, and afterward break down the items (carbon dioxide and water), we would identify molar proportion as $2:1$ among hydrogen and carbon.
Since polypropylene is the polymer of the propylene monomer, we would notice they have similar empirical formulas. Both propene and polypropene have empirical formula $C{H}_2$.

Note: For several ionic compounds such as calcium chloride $\left(CaC{l}_2\right)$ and for larger molecules like silicon dioxide $\left(Si{O}_2\right)$, the empirical formula is standard. We should not get confused between molecular formula and empirical formula, empirical formula provides the simplest whole ratio of the atoms whereas molecular formula provides the number of each kind of atom found in the compound.