9.12 moles and 164.5 g.
This means that every mole of ammonium sulfide will contain 2 moles of ammonium cations and 1 mole of sulfide ions.
Since you have 4.560 moles of ammonium sulfide, you'll also have
To determine how many grams of ammonium sulfide would contain this many moles, use the ion's molar mass
You can also determine how many grams of ammonium ions you'd get by using percent composition.
This means that 100 g of ammonium sulfide will contain 52.94 g of ammonium ions.
The mass of ammonium sulfide would be
This means that you get