How many moles of Cu are in 7.8 times 10²¹ atoms of Cu?
O 0.013 mole
O 63.55 moles
O 1.2 x 10²⁰ moles
O 5.0 x 0²³ moles
O 6.02 x 10²³ moles
O 4.7 x 10⁴⁵ moles