How many moles of oxygen are in 3.45 mol of diphosphorus pentoxide?

Question

options:
5.75 mol O
13.5 mol O
6.90 mol O
3.45 mol O
17.3 mol O

Answer 1

There are 5 moles oxygen atoms in 1 mole P2O5; therefore, there must be 3.45 x 5 = ?? moles oxygen in 3.45 moles.

Answer 2

3.45 mol x 5 mol O/1 mol P2O5=
17.3 mol of Oxygen