Answer:
empirical formula for a compound : ZnO
Further explanation
The empirical formula is the smallest comparison of atoms of compound =mole ratio of the components
The principle of determining empirical formula
Determine the mass ratio of the constituent elements of the compound.
Determine the mole ratio by by dividing the percentage by the atomic mass
Percentage Oxygen :
100\%-80.2%=19.8\%
mol ratio for Zn : O =