Chapter 7.4, Problem 7.40QAP

Calculate the mass percent composition of each of the following:

1. ${\text{CaCl}}_{\text{2}}$ calcium chloride
2. ${\text{Na}}_{\text{2}}{\text{Cr}}_{\text{2}}{\text{O}}_{\text{7}}$, sodium dichromate
3. ${\text{C}}_{\text{2}}{\text{H}}_{\text{3}}{\text{Cl}}_{\text{3}}$, trichloroethane, a cleaning solvent
4. ${\text{Ca}}_{\text{3}}{\left({\text{PO}}_{\text{4}}\right)}_2$, calcium phosphate, found in bone and teeth
5. ${\text{C}}_{\text{18}}{\text{H}}_{\text{36}}{\text{O}}_{\text{2}}$, stearic acid, a fatty acid