Question

Calculate the no. Atoms in 46g of Na.
(Atomic mass =23u)

Answer 1

No of moles = Weight of the element / Atomic Mass
No of moles = 46 g / 23 u
No of moles = 2 gmu
Now.
No of atoms = Avogadro Number * No of moles
No of atoms = 6.022 * 10^23 * 2
= 12.044 * 10^23 atoms are there in 46 grams of Sodium.