How many moles of (NH4)2SO4 are there in 100.00 g of ammonium sulfate? How many moles of ammonium ions are in 100.00 g of ammonium sulfate? How many ammonium ions are in 100.00 grams of ammonium sulfate? Use Avogadro's number, 6.0221 x 1023 ions/mol.