Q. 6.125 - An Introduction to General, Organic, and Biological Chemistry

Question

Determine the total number of valence electrons in each of the

following:                                                                                                               

a. ${\mathrm{HNO}}_2$

b. ${\mathrm{CH}}_3\mathrm{CHO}$

c. ${\mathrm{CH}}_3{\mathrm{NH}}_2$

Step-by-Step Solution

Answer

a. The total number of valence electrons in $HN{O}_2$is$18$.

b. The total number of valence electrons in $C{H}_{3}CHO$is$18$.

c. The total number of valence electrons in $C{H}_{3}N{H}_2$is$14$.

Part(a) Step 1: Given Information

We are required to find the total number of valence electrons of Nitrous Acid.

Part(a) Step 2: Explanation

We know that Hydrogen has $1$electron in its valence shell. Similarly Nitrogen has $5$ and Oxygen has $6$ valence electrons but as there are two oxygen atoms in Nitrous Acid hence they will contribute $12$electrons to the total. Adding all these we get total valence electrons equal to $18$.

Part(b) Step 1: Given Information

We are required to find the total number of valence electrons of Ethanal.

Part(b) Step 2: Explanation

We know that Hydrogen has $1$ electron in its valence shell. Similarly Carbon has $4$ and Oxygen has $6$ valence electrons but as there are two carbon atoms and four hydrogen atoms in Ethanol hence they will contribute $8$ and $4$electrons respectively to the total. Adding all these we get total valence electrons equal to $18$.

Part(c) Step 1: Given Information

We are required to find the total number of valence electrons of Methanamine.

Part(c) Step 2: Explanation

We know that Hydrogen has $1$ electron in its valence shell. Similarly Carbon has $4$ and Nitrogen has $5$ valence electrons but as there are five hydrogen atoms in Ethanol hence they will contribute net $5$ electrons to the total. Adding all these we get total valence electrons equal to $14$.