6.022 * ten to power 23
1 Molecule oxygen consists of 2 atoms. 1 mole O2 = 6.02. 1023 molecules (number of Avogadro).
So the number of atoms: 2 x 6.02 x 1023
So the number of atoms: 2 x 6.02 x 1023
There are 2 molecules in oxygen (02). APART from the Ozone molecules which is O3. This is because the UV rays smash 3 lots of 02 molecules into 2 lots of 03 molecules.
Take the atomic mass of oxygen and use this formula: # times avogadro's numbers(3.62 times 10 to the 4th power.) of what I remember from chemistry. Good luck!