The number of moles = 0.5
Further explanation
Given
3.01 x 10²³ atoms Cu
Required
moles
Solution
The mole is the number of particles(molecules, atoms, ions) contained in a substance 
1 mol = 6.02.10²³ particles 
Can be formulated 
N=n x No 
N = number of particles 
n = mol 
No = Avogadro's = 6.02.10²³ 
Input the value :
n = N : No
n = 3.01 x 10²³ : 6.02.10²³ 
n = 0.5