The number of moles of copper can be calculated using the formula:

```

Moles = Number of atoms / Avogadro's number

```

Where Avogadro's number is 6.022 × 10^23 atoms/mole.

Plugging in the given number of atoms, we get:

```

Moles = 1.81 × 10^24 / 6.022 × 10^23

```

```

Moles ≈ 3.00 moles

```

Therefore, there are approximately 3.00 moles of copper in 1.81 × 10^24 atoms of copper.