How many moles of oxygen (o) atoms are in a sample of 3.98 × 1023 atoms?

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 number of atoms.

As we are given that:

Number of oxygen atoms =

Now we have to determine the moles of oxygen atoms.

As, atoms of oxygen present in 1 mole of oxygen

So, atoms of oxygen present in mole of oxygen

Therefore, the number of moles of oxygen atoms present in a sample is 0.661 moles.