How many atoms of phosphorus are in 2.10 mol of copperii phosphate?

Phosphorus pentachloride is the chemical name for the molecular formula of PCl5. At Standard Temperature and Pressure (STP) one mole corresponds to Avogadro's number of 6.02x10^23 particles. Using molar ratiOS we know that for every 1 mole of PCl5 we have 1 mole of P. a ratio of 1:1. Answering this question therefore is multiplying our given quantity of 2.97 moles by 6.02x10^23 yielding out answer of 1.79x10^24 atoms.