Question: how many moles of ions are in 0.0200 g agno3?
Answer: How many moles of ion are in the following? No, you divided 0.02 by 169.87 to obtain 0.000118 mols AgNO3. The formula tells you that you have 1 mol Ag^+ per mol AgNO3 and 1 mol NO3^- per mol AgNO3.