Question

one atom sodium weighs 23g ;avagadro no.of sodium atoms also weighs 23g. someone plz explain how is that possible?

Answer 1

Answer:

One atom of sodium does not weigh 23 g. 1 atom of sodium is 23 u  (atomic mass) which is different from 23 g. One atom of sodium actually weighs 38.18 × 10⁻²⁴g. On the other hand, Avogadro no. of atoms is 1 mole of atoms and 1 mole of any element always has its mass as the atomic weight in grams.

Eg: Weight of Avagadro no.of sodium atoms = 23g

Weight of Avagadro no.of iron atoms=56 g

Weight of Avagadro no.of copper atoms=64g

BUT

Weight of one atom of sodium=38.18× 10⁻²⁴g

Weight of one atom of iron=92.96× 10⁻²⁴g

Weight of one atom of copper=106.24× 10⁻²⁴g

Hope you understood! If you still have any doubt ask me in the comments :))