Give the mass in grams of diphosphorus pentoxide that contains 2.0 x 10^(24) oxygen atoms.

Answer 1

P2O5
2E24/6.022E23 = moles O atoms.
moles O atoms/5 = moles P2O5 molecules.
moles P2O5 = grams P2O5/molar mass P2O5. Solve for grams P2O5.