Chapter 19, Problem 108IE

(a)

Interpretation Introduction

To determine: The Lewis structure of ${\text{CS}}_2$ molecule; also the way to predict its bond order of $\text{C}-\text{S}$ bond.

Solution: The Lewis structure of ${\text{CS}}_2$ is drawn. The bond order is determined by calculating the number of bonds between carbon and oxygen atoms in the Lewis structure.

Explanation:

The Lewis structure for a given compound is the representation of bonding and non bonding electron pairs in a molecule. The Lewis structure represents the number of single bonds and double bonds in the molecule along with the lone pair of electrons.
The electronic configuration of $\text{C}$ and $\text{S}$ is,

$\begin{array}{l}\text{C}=1{\text{s}}^2{\text{2s}}^2{\text{2p}}^2\\ \text{S}=1{\text{s}}^2{\text{2s}}^2{\text{2p}}^6{\text{3s}}^2{\text{3p}}^4\end{array}$

Since, carbon atom has two electrons in its $\text{p}$ orbital, it can accept four more electrons and sulphur atom contains four atoms in its $\text{p}$ orbital, it can accept two more electrons. Therefore, the carbon atoms makes double bond with two sulphur atoms to satisfy its valancy.
The Lewis structure of ${\text{CS}}_2$ molecule is,

Figure 1

The bond order is defined as the number of bonds between two atoms in a molecule. It is determined by the Lewis structure of the molecules. The number of bonds between carbon and sulphur in its structure are 2. Therefore, the bond order of $\text{C}-\text{S}$ bond in ${\text{CS}}_2$ molecule is 2.

Conclusion:

The Lewis structure of ${\text{CS}}_2$ is drawn. The bond order is determined by calculating the number of bonds between carbon and oxygen atoms in the Lewis structure

(b)

Interpretation Introduction

To determine: The structure of ${\text{CS}}_2$ molecule by using the VSEPR method.

(c)

Interpretation Introduction

To determine: The balanced chemical equation for the given reaction.

(d)

Interpretation Introduction

To determine: The values of $\Delta H^0$ and $\Delta G^0$ for the given reaction; If the reaction is exothermic and spontaneous or not.

(e)

Interpretation Introduction

To determine: The value of $\Delta S^0$ for the vaporization of ${\text{CS}}_2\left(l\right)$ ; if the sign of $\Delta S^0$ favors vaporization or not.

(f)

Interpretation Introduction

To determine: The boiling point of ${\text{CS}}_2\left(l\right)$ ; if the ${\text{CS}}_2$ a liquid or gas at $298\text{K}$ and $1\text{atm}$ .