What is the empirical formula for a compound which contains 80.2% zinc and the rest is oxygen

The empirical formula for a compound : ZnO

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 =

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )