Textbook Problem

Give the total number of valence electrons in each of the following molecules.

msp;  $\begin{array}{l}\text{a}.{\text{ B}}_{\text{2}}{\text{O}}_{\text{3}} \text{c}.{\text{ C}}_{\text{2}}{\text{H}}_{\text{6}}\text{O}\\ \text{b}.{\text{ CO}}_{\text{2}} \text{}\text{}\text{}\text{} \text{d}.{\text{ NO}}_{\text{2}}\end{array}$