How many atoms are contained in the chemical formula #2AgNO_3#?
In one silver nitrate formula unit, there are 3 oxygen ATOMS, 1 nitrogen ATOM, and 1 silver atom.
Quite clearly, in 2 formula units of silver nitrate, there are 2 silver atoms, 2 nitrogen atoms, and 6 oxygen atoms.
We can improve this answer by using the mole concept. The mole is simply a VERY large number:
If we have 2 moles of silver nitrate, there are