Question

Calculate the number of atoms in a 3.96 × 103 g sample of silicon.

Answer 1

Atomic mass Si = 28.0855 u.m.a

28.0855 g -------------------- 6.02x10²³ atoms
3.96x10³ g ------------------- ?? atoms

( 3.96x10³) x 6.02x10²³ / 28.0855 =

8.48x10²⁵ atoms