Question

Number of atoms in 560 g Fe is:

• A. twice that of 70 g nitrogen
• B. half that of 20 g hydrogen
• C. Both A and B
• D. none of the above

Answer 1

Answer: (C)

Both A and B

560 g of Fe is 10 moles which is equal to $10\times N_A$ atoms
70 g of $N_2$ corresponds to $5\times N_A$ atoms, thus twice of it is $10\times N_A$ atoms
20 g $H_2$ means $20\times N_A$ atoms, half of it is $10\times N_A$ atoms