Question

a chemical formula of a compound does not represent why

Answer 1

Ca + CO3 = CaCO3
Calcium + carbonate gives calcium carbonate

Answer 2

A chemical formula identifies each constituent element by its chemical symbol and indicates the proportionate number of atoms of each element. In empirical formulas, these proportions begin with a key element and then assign numbers of atoms of the other elements in the compound, by ratios to the key element.