
Concept explainers
(a)
Interpretation:
The electron dot formula and structural formula for HOCl molecule, is to be stated.
Concept introduction:
The electron dot formula shows the valence electrons which form the bond between the atoms in a molecule. The electron pairs that are shared by the atoms are known as bonding electrons. The other electrons that are present in order to complete the octet are known as non-bonding electrons. The electron dot formula is also known as the Lewis structure.

Answer to Problem 36E
The electron dot formula for HOCl molecule is shown below.
The structural formula for HOCl molecule is shown below.
Explanation of Solution
The total number of valence electron in HOCl molecule is the sum of valence electron of one oxygen atom, one chlorine atom and one hydrogen atom. The number of valence electron in each oxygen atom is six. The number of valence electron in each chlorine atom is seven. The number of valence electron in each hydrogen atom is one. Therefore, the total number of valence electron in HOCl molecule is calculated as shown below.
Total number of valence electron=(1+6+7) e−=14 e−
Therefore, the number of electron pair is seven (14/2=7). The electron dot formula for HOCl molecule is shown below.
Figure 1
Out of seven electron pairs, two electron pairs are involved in bonding. Therefore, there is five lone pair. The structural formula for HOCl molecule is shown below.
Figure 2
The electron dot formula for HOCl molecule is shown in figure 1.
The structural formula for HOCl molecule is shown in figure 2.
(b)
Interpretation:
The electron dot formula and structural formula for SO2 molecule, is to be stated.
Concept introduction:
The electron dot formula shows the valence electrons which form the bond between the atoms in a molecule. The electron pairs that are shared by the atoms are known as bonding electrons. The other electrons that are present in order to complete the octet are known as non-bonding electrons. The electron dot formula is also known as the Lewis structure.

Answer to Problem 36E
The electron dot formula for SO2 molecule is shown below.
The structural formula for SO2 molecule is shown below.
Explanation of Solution
The total number of valence electron in SO2 molecule is the sum of valence electron of one sulfurs atom and two oxygen atoms. The number of valence electron in each sulfur atom is six. The number of valence electron in each oxygen atom is six. Therefore, the total number of valence electron in SO2 molecule is calculated as shown below.
Total number of valence electron=(6+(2×6)) e−=(6+12) e−=18 e−
Therefore, the number of electron pair is nine (18/2=9). The electron dot formula for SO2 molecule is shown below.
Figure 3
Out of nine electron pairs, only four electron pairs are involved in bonding. Therefore, there is five lone pair. The structural formula for SO2 molecule is shown below.
Figure 4
The electron dot formula for SO2 molecule is shown in Figure 3.
The structural formula for SO2 molecule is shown in Figure 4.
(c)
Interpretation:
The electron dot formula and structural formula for CS2 molecule, is to be stated.
Concept introduction:
The electron dot formula shows the valence electrons which form the bond between the atoms in a molecule. The electron pairs that are shared by the atoms are known as bonding electrons. The other electrons that are present in order to complete the octet are known as non-bonding electrons. The electron dot formula is also known as the Lewis structure.

Answer to Problem 36E
The electron dot formula for CS2 molecule is shown below.
The structural formula for CS2 molecule is shown below.
Explanation of Solution
The total number of valence electron in CS2 molecule is the sum of valence electron of one carbon atom and two sulfur atoms. The number of valence electron in each carbon atom is four. The number of valence electron in each sulfur atom is six. Therefore, the total number of valence electron in CS2 molecule is calculated as shown below.
Total number of valence electron=(4+(2×6)) e−=(4+12) e−=16 e−
Therefore, the number of electron pair is eight (16/2=8). The electron dot formula for CS2 molecule is shown below.
Figure 5
Out of eight electron pairs, four electron pairs are involved in bonding. Therefore, there is four lone pair. The structural formula for CS2 molecule is shown below.
Figure 6
The electron dot formula for CS2 molecule is shown in Figure 5.
The structural formula for CS2 molecule is shown in Figure 6.
(d)
Interpretation:
The electron dot formula and structural formula for C2H2 molecule, is to be stated.
Concept introduction:
The electron dot formula shows the valence electrons which form the bond between the atoms in a molecule. The electron pairs that are shared by the atoms are known as bonding electrons. The other electrons that are present in order to complete the octet are known as non-bonding electrons. The electron dot formula is also known as the Lewis structure.

Answer to Problem 36E
The electron dot formula for C2H2 molecule is shown below.
The structural formula for C2H2 molecule is shown below.
Explanation of Solution
The total number of valence electron in C2H2 molecule is the sum of valence electron of two carbon atom and two hydrogen atoms. The number of valence electron in each carbon atom is four. The number of valence electron in each hydrogen atom is one. Therefore, the total number of valence electron in C2H2 molecule is calculated as shown below.
Total number of valence electron=((2×4)+(2×1)) e−=(8+2) e−=10 e−
Therefore, the number of electron pair is five (10/2=5). The electron dot formula for C2H2 molecule is shown below.
Figure 7
All electron pair is involved in bonding. Therefore, there is no lone pair. The structural formula for C2H2 molecule is shown below.
Figure 8
The electron dot formula for C2H2 molecule is shown in Figure 7.
The structural formula for C2H2 molecule is shown in Figure 8.
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Chapter 12 Solutions
EP INTRODUCTORY CHEM.-MOD.MASTERINGCHEM
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