Question

How many moles of Oxygen atoms are in a sample of 3.98 x 10^23 atoms?

Answer 1

$1mol\ \ \ \ \rightarrow \ \ \ 6,02*10^{23}\\ x \ \ \ \ \ \ \ \ \ \rightarrow \ \ \ 3,98*10^{23}\\\\ x=\frac{3,98*10^{23}*1mol}{6,02*10^{23}}\approx0,66mol$

Answer 2

Explanation:

As per the mole concept, there are $6.022 \times 10^{23} atoms$ present in 1 mole of a substance.

Mathematically,    1 mole = $6.022 \times 10^{23}$ atoms or molecules

Therefore, number of moles of oxygen atoms present in $3.98 \times 10^{23}$ atoms are calculated as follows.

                 $\frac{3.98 \times 10^{23} atoms}{6.022 \times 10^{23}atoms/mol}$

                  = 0.66 mol

Thus, we can conclude that there are 0.66 moles of oxygen atoms are in a sample of $3.98 \times 10^{23} atoms$.