Question

Which of the following will contain the highest number of oxygen atoms?

• A. 16 g of O atom
• B. 32 g of $O_2$ molecule
• C. 48 g of $O_3$ molecule
• D. None, all have the same number of oxygen atoms

Answer 1

The correct option is D None, all have the same number of oxygen atoms

A) 16g of O atom = $N_A$ atoms. Hence 1g of O atom = $\frac{N_A}{16}$ atoms = 0.0625 atoms
B) 32g of $O_2$ molecule = $2\times N_A$ atoms. Hence 1g of $O_2$ molecule = $\frac{2\times N_A}{32}$ atoms = 0.0625 atoms
C) 48g of $O_3$ molecule = $3\times N_A$ atoms. Hence 1g of $O_3$ molecule = $\frac{3\times N_A}{48}$ atoms = 0.0625 atoms.