Study the balanced equation.
3O_2=2O_3
When 4.26 x 10^16 mol of oxygen (O) are converted into ozone, how many mol of the pollutant (O3) are formed?
Oxygen is O2 and not O.
4.26E16 mol x (2 mol O3/3 mols O2) - 4.2E16 x 2/3 = ?
That 4.25E16 is a huge number; I'm wondering if you intended to write molecules and not mols.