Explanation:
As per the mole concept, there are [tex]6.022 \times 10^{23} atoms[/tex] present in 1 mole of a substance.
Mathematically, 1 mole = [tex]6.022 \times 10^{23}[/tex] atoms or molecules
Therefore, number of moles of oxygen atoms present in [tex]3.98 \times 10^{23}[/tex] atoms are calculated as follows.
[tex]\frac{3.98 \times 10^{23} atoms}{6.022 \times 10^{23}atoms/mol}[/tex]
= 0.66 mol
Thus, we can conclude that there are 0.66 moles of oxygen atoms are in a sample of [tex]3.98 \times 10^{23} atoms[/tex].
