Question

Determine the number of atoms in 4.56x10-2g Na

Answer 1

Molar mass Na = 23 g/mol

23 g ------------- 6.02 x 10²³ atoms
4.56 x 10⁻² g ----- ? atoms

atoms = 4.56 x 10⁻²  x ( 6.02 x 10²³ ) / 23

atoms = 2.74 x 10²² / 23

= 1.19 x 10²¹ atoms

hope this helps!