Answer : The number of moles of oxygen atoms present in a sample is 0.661 moles.
Explanation :
As we know that,
1 mole of substance contains [tex]6.022\times 10^{23}[/tex] number of atoms.
As we are given that:
Number of oxygen atoms = [tex]3.98\times 10^{23}[/tex]
Now we have to determine the moles of oxygen atoms.
As, [tex]6.022\times 10^{23}[/tex] atoms of oxygen present in 1 mole of oxygen
So, [tex]3.98\times 10^{23}[/tex] atoms of oxygen present in [tex]\frac{3.98\times 10^{23}}{6.022\times 10^{23}}=0.661[/tex] mole of oxygen
Therefore, the number of moles of oxygen atoms present in a sample is 0.661 moles.
