Determine how much ozone contains 5.421 * 10 ^ 22 oxygen atoms.

Given:
N (O) = 5.421 * 10 ^ 22
NA = 6.02 * 10 ^ 23 mol − 1

Find:
n (O3) -?

1) One ozone molecule contains three oxygen atoms. Calculate the number of ozone molecules:
N (O3) = N (O) / 3 = 5.421 * 10 ^ 22 = 1.807 * 10 ^ 22;
2) Calculate the amount of ozone substance:
n (O3) = N (O3) / NA = 1.807 * 10 ^ 22 / 6.02 * 10 ^ 23 = 0.03 mol.

Answer: The amount of substance O3 is 0.03 mol.