Accurately find the mass of about 1.5g of solid ammonium nitrate. Ammonium nitrate is a solid crystal composed of ammonium and nitrate ions. What type of bond/force holds an ammonium ion tightly to a nitrate ion? Justify your answer. Weeeell, I got the last half of the question (Ionic bonds hold together ions, which is what an ammonium ion and a nitrate ion is -_-) ... But I have no idea on how to find the mass of the ammonium nitrate... Help? Steps please if possible :)