Answer 1

12.044 × 10²⁵ atoms of phosphorus

6.022 × 10²³ atoms of phosphorus = 1 mole

12.044 × 10²⁵ atoms of phosphorus = 12.044 × 10²⁵/6.022 × 10²³ = 199.9 moles or 200 moles

Hence, 12.044 × 10²⁵ atoms of phosphorus have 200 moles.