Question

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

• A. 1g of O atom
• B. 1 g of molecule
• C. 1 g of molecule
• D. All

Answer 1

Answer: (D)

All

A) 16g of O atom= $N_A$ atoms . Hence 1g of O atom = $\frac{N_A}{16}$ atoms=0.0625 atoms

B) 32 g of $O_2$ molecule= $2\times N_A$ atoms . Hence 1g of $O_2$ molecule = $2\times \frac{N_A}{32}$ atoms=0.0625 atoms

C) 48g of $O_3$ molecule = $3\times N_A$ atoms . Hence 1g of $O_3$ molecule = $3\times \frac{N_A}{48}$ atoms=0.0625 atoms