Q. Number of atoms in 560 g of Fe ($atomic\ mass\ 56\ g\ {mol}^{- 1}$) is
A) Twice that of 70 g N
B) Half that of 20 g H
C) Both are correct
D) None of these
Explanation
(c)
Moles of Fe=$\frac{560}{56} = 10$
Moles of N=$\frac{70}{14} = 5$
Moles of H=$\frac{20}{1} = 20$
Equal number of moles have equal number of atoms.
Hence, number of atoms in 560 g of Fe is twice that of 70 g N and is half that of 20 g of H.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.