Which has more number of atoms - 100g of sodium or 100g of iron? Justify your answer. (atomic mass of sodium = 23u, atomic mass of iron = 56u)

For sodium

Given: Mass of sodium = 100g

Molar mass of sodium = 23u

Number of atoms = number of moles × 6.022 × 10²³

⇒

⇒

⇒ Number of atoms = 4.34 × 6.022 × 10²³

^⇒ Number of atomss = 2.613 × 10²⁴

^⇒ Thus, 100g of sodium contains 2.613 × 10²⁴ atoms.

For iron

Given: Mass of iron = 100g

Molar mass of iron = 55.8u

Number of atoms = number of moles × 6.022 × 10²³

⇒

⇒

⇒ Number of atoms = 1.79× 6.022 × 10²³

^⇒ Number of atoms = 1.07× 10²⁴

^⇒ Thus, 100g of iron contains 1.07× 10²⁴ atoms.

Therefore, 100g of sodium has more number of atoms.