Question

how many percentage of oxygen are there in the atmosphere of the Mars​

Answer 1

In Mars the atmosphere is mainly composed of carbondioxide .

Percentage of oxygen O2 present there is 0.16.

It is present in molecular form

Answer 2

atmosphere at the surface: 95% by volume of carbon dioxide (CO2), 2.6% molecular nitrogen (N2), 1.9% argon (Ar), 0.16% molecular oxygen (O2), and 0.06% carbon monoxide (CO)