Chapter 2, Problem 78RQ

2.78 How many atoms of each kind are represented in the following formulas? For each, name the elements present. $\left(\text{a}\right){\text{H}}_{\text{3}}{\text{PO}}_{\text{4}}{}^{\text{,}}\left(\text{b}\right)\text{Ca}{\left({\text{H}}_{\text{2}}{\text{PO}}_{\text{4}}\right)}_{\text{2}}{}^{\text{,}}\left(\text{c}\right){\text{C}}_{\text{4}}{\text{H}}_{\text{9}}\text{Br,}\left(\text{d}\right){\text{Fe}}_{\text{3}}{\left({\text{AsO}}_{\text{4}}\right)}_{\text{2}}\text{,}\left(\text{e}\right){\text{ C}}_{\text{3}}{\text{H}}_{\text{5}}{\left(\text{OH}\right)}_{\text{3}}$