Calcium oxide is CaO.
A formula unit is an empirical formula.
An empirical formula has no data about the structure of a compound.
C5H6O is the empirical formula for Cortisol.
The empirical formula tells you the simplest formula for the compound. The molecular formula will be some multiple of the empirical formula, or it can be identical to the empirical formula.
C13H18O2 Is the empirical formula. It has the same molecular formula too.
CaO is the empirical formula for calcium oxide.
The empirical formula of calcium oxide is CaO, the same as the formula unit.
Calcium sulfide is CaS. This is the empirical formula as well.
Formula = Ca3N2
The chemical formula of calcium carbonate is CaCO3.
The calcium iodide is CaI2.
The calcium sulfide is CaS.
Calcium = Ca Carbon = C oxide = O(2-) Calcium carbonate = CaCO3
Calcium + Nitric Acid -----> Calcium Nitrate + Hydrogen