Question

1. How many moles of Cu are in 1.48 × 1025 Cu atoms?

Answer 1

1 mole ------------- 6.02 x 10²³ atoms
( moles Cu) ------- 1.48 x 10²⁵ atoms

moles Cu =  ( 1.48 x 10²⁵ ) x 1 / 6.02 x 10²³

moles Cu = 1.48 x 10²⁵ / 6.02 x 10²³

= 24.58 moles of Cu

hope this helps!