How many total atoms are in 0.330 g of P2O5?

A) covert 0.330g to moles by dividing by molar mass of P2O5 ... Let's call this Y moles

B) 1 mole of anything contains the Avogradro Number of molecules

So here it is 6.02 x 10^23 x Y molecules

C) work out how many atoms in each molecule 2P + 5O total 7

So multiply answer to B by 7 to get final answer