Question

The ratio of the number of atoms in one mole of oxygen to the number of atoms in one-mole ozone is _____.

• A.
• B. $\frac{4}{5}$
• C. $\frac{7}{5}$
• D. $\frac{2}{5}$

Answer 1

The correct option is A

Oxygen is diatomic ($O_2$) and Ozone is triatomic ($O_3$).

Thus,

1 mole of Oxygen = 6.022 $\times$ ${10}^{23}$ molecules of $O_2$ = 2 $\times$ 6.022 $\times$ ${10}^{23}$ atoms of O.

1 mole of Ozone = 6.022 $\times$ ${10}^{23}$ molecules of $O_3$ = 3 $\times$ 6.022 $\times$ ${10}^{23}$ atoms of O

The ratio is = $\frac{2\times 6.022\times {10}^{23}}{3\times 6.022\times {10}^{23}}$ = $\frac{2}{3}$