Question

How many moles of P4O10 can be produced with 8.084e-001 moles of the limiting reagent?

Answer 1

What in the world is 8.084e-001 mols?

P4 + 5O2 ==> P4O10
It depends.
If the limiting reagent is P4, you can produce 8.084e-001 mols whatever that means.
If the limiting reagent is O2, you can produce 1/5 that whatever that means.