Question

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)



PLEASE ANSWER FAST​

Answer 1

100g of sodium has more number of sodium atoms as its atomic mass is less than that of iron. So it needs more number of atoms to be equal numerically in mass with mass of iron given.

Answer 2

Given

Atomic mass of Na = 23 u

Atomic mass of Fe = 56 u

Then, gram atomic mass of Na = 23 g

Now, 23 g of Na contains = 6.022 x 1023 g number of atoms

Thus, 100 g of Na contains = 6.022 x 1023 / (23 x 100 number of atoms)

 100 g of Na contains = 2.6182 x 1024 number of atoms

Then, gram atomic mass of Fe = 56 g

Now, 56 g of Fe contains = 6.022 x 1023 g number of atoms

Thus, 100 g of Fe contains = 6.022 x 1023 / (56 x 100 number of atoms)

100 g of Fe contains = 1.0753 x 1024 number of atoms

Therefore, 100 grams of sodium contains more number of atoms than 100 grams of iron.