Chapter 9, Problem 10Q

(a)

Interpretation Introduction

Interpretation:

The given structural formula of styrene has to be redrawn showing all atoms in it.

Concept Introduction:

The Structural formula of a compound shows how the atoms are arranged in a molecule and, in particular, shows which functional groups are present.

Functional group: They are certain substitutes in the organic molecules which determine the characteristic reactions taking place in it.

Line-angle drawing:

• • The structure of a molecule can be represented using a line-angle drawing.
• • Each vertex is assumed to have one carbon atom.
• • If a line is extended from the backbone indicates another carbon atom which will be a methyl group unless the symbol for another element is given.
• • In line-angle drawing, hydrogen atoms are not indicated.

(b)

Interpretation Introduction

Interpretation:

The styrene chemical formula has to be identified.

Concept Introduction:

Chemical formula of a compound is the symbolic representation of its atomic constituents.

(c)

Interpretation Introduction

Interpretation:

The molar mass for polystyrene consists of $5000$ monomers has to be calculated.

Concept Introduction:

Molar mass: It is obtained by dividing the mass of substance with the amount of substance and the S.I. unit of molar mass is $\text{kg/mol}$. It is numerically equal to the molecular weight since molecular weight is sum of all individual atom weight present in molecule which is represented in $amu$.

  $\text{Molar}\text{mass}\left(\text{g/mol}\right)=\frac{\text{Given}\text{mass}\text{of}\text{substance}\left(\text{g}\right)}{\text{Moles}\text{of}\text{substance}\left(mol\right)}$

Monomer: A molecule is considered as monomer when this molecule bonds with another identical molecule which results to form polymer.

Polymers: Monomers combine together to form polymers. Monomers are the repeating units of small molecules which link together to form polymers and the process is called as polymerization.