Question

Find the number of O-atoms in $\frac{2}{3}$ moles of $N{O}_2$.

• A. $4.014\times {10}^{23}$
• B. $4.014\times {10}^{20}$
• C. $8.029\times {10}^{23}$
• D. $8.029\times {10}^{20}$

Answer 1

The correct option is C $8.029\times {10}^{23}$

1 mole of $N{O}_2$ contains 2 moles of O-atoms.
So, $\frac{2}{3}$ moles of $N{O}_2$ will contain $\frac{4}{3}$ moles of O-atoms.
Again, 1 mole of O-atoms = $6.022\times {10}^{23}$ O-atoms
Therefore, $\frac{4}{3}$ moles of O-atoms $=\frac{4}{3}\times 6.022\times {10}^{23}$
$=8.029\times {10}^{23}$ O-atoms