Question

Which of the following contains greatest number of oxygen atoms?

• A. $1$ g of $O$
• B. $1$ g of $O_2$
• C. $1$ g of $O_3$
• D. All have the same number of atoms

Answer 1

The correct option is D All have the same number of atoms

Number of moles=$\frac{Massingram}{Molarmass}$

Number of moles $=\frac{Numberofparticle}{N_A}$

For option A

Moles of O atom=$\frac{1}{16}$

Number of O atom= $\frac{N_A}{16}$

For option B

Moles of $O_2$=$\frac{1}{32}$

Moles of O atom=$\frac{2}{32}$

Number of O atom= $\frac{N_A}{16}$

For option C

Moles of $O_3$= $\frac{1}{48}$

Moles of O atom $=\frac{3}{48}$=$\frac{1}{16}$

Number of O atom=$\frac{N_A}{16}$

Hence all contain same number of atoms